Seeing your dog vomiting and having diarrhea at the same time is unsettling. Sometimes the cause is something relatively minor, such as eating table scraps, getting into the garbage, changing foods too quickly, or experiencing a stressful event. But the same combination of symptoms can also occur with parasites, infections, pancreatitis, poisoning, intestinal obstruction, and serious diseases affecting other organs.
Vomiting is the active expulsion of stomach contents, while diarrhea involves loose or watery stools that occur more frequently than normal. Either problem can cause fluid and electrolyte loss. When both happen together, dehydration can develop more quickly, particularly in puppies, small dogs, senior dogs, and dogs with underlying medical conditions.
The good news is that not every episode requires an emergency visit. A healthy adult dog that vomits once, has a small amount of uncomplicated diarrhea, remains alert, drinks normally, and shows no signs of pain may sometimes be monitored closely. However, the situation changes when vomiting becomes repeated, blood appears, your dog becomes weak or lethargic, or your pet cannot keep water down.
This guide explains the most common causes of dog vomiting and diarrhea, warning signs to watch for, what you can safely do at home in mild cases, how veterinarians diagnose the problem, and when professional treatment is necessary.
Important: This article provides general educational information and is not a substitute for an examination by a veterinarian. If your dog is seriously ill, worsening rapidly, or may have swallowed a toxin or foreign object, contact a veterinarian or emergency veterinary hospital promptly.
Quick Answer: Why Is My Dog Vomiting and Having Diarrhea?
Dogs may vomit and develop diarrhea for many different reasons. The most common include:
- Dietary indiscretion, such as eating garbage or spoiled food
- Sudden changes in dog food
- Food intolerance
- Stress
- Intestinal parasites
- Bacterial or viral infections
- Pancreatitis
- Toxin exposure
- Foreign-body ingestion
- Gastroenteritis
- Inflammatory bowel disease
- Kidney or liver disease
- Certain cancers or other systemic illnesses
VCA notes that vomiting and diarrhea can result from relatively simple gastrointestinal irritation but can also occur with potentially life-threatening problems such as obstruction, poisoning, or serious infection.
When Can Mild Symptoms Be Monitored?
A short episode may sometimes be monitored when an otherwise healthy adult dog:
- Has only mild diarrhea
- Has vomited only once
- Is alert and responsive
- Is still interested in water
- Has no significant abdominal pain
- Has no blood in vomit or stool
- Is not becoming progressively weaker
Even then, close observation matters. A condition that initially looks mild can worsen.
When Does It Become Concerning?
Contact a veterinarian promptly if your dog:
- Vomits repeatedly
- Has multiple episodes of watery diarrhea
- Becomes lethargic
- Refuses food or water
- Cannot keep water down
- Has blood in the vomit or stool
- Has black or tarry stool
- Appears painful
- Becomes weak or unsteady
- Has a fever
- May have eaten something poisonous
- May have swallowed a foreign object
VCA recommends veterinary assessment for repeated vomiting, multiple episodes of diarrhea, lethargy, appetite loss, or blood in the stool.
A Simple Rule to Remember
Vomiting plus diarrhea accompanied by lethargy, blood, significant pain, dehydration, repeated episodes, or an inability to keep water down deserves prompt veterinary attention.
Understanding Vomiting and Diarrhea in Dogs
What Is Vomiting in Dogs?
Vomiting is the active expulsion of material from the stomach or upper gastrointestinal tract. It commonly involves nausea, abdominal contractions, retching, lip licking, drooling, or repeated swallowing before the stomach contents are expelled.
The material may contain:
- Partially digested food
- Water or liquid
- Yellow bile
- Mucus
- Foam
- Grass
- Foreign material
- Blood
Vomiting itself is a symptom, not a disease. It can accompany everything from mild dietary upset to gastrointestinal obstruction, pancreatitis, kidney disease, liver disease, infections, and toxin exposure.
An isolated episode of vomiting in an otherwise healthy dog does not automatically mean something serious is happening. The important questions are how often the dog is vomiting, what the vomit looks like, what other symptoms are present, and whether the dog’s overall behavior has changed.
Acute vs. Chronic Vomiting
Acute vomiting develops suddenly and may last for a relatively short period.
Possible triggers include:
- Eating something inappropriate
- Sudden dietary changes
- Gastroenteritis
- Parasites
- Toxin exposure
- Infection
Chronic or recurrent vomiting is more concerning because it may point toward an ongoing underlying problem.
Possible causes include:
- Chronic gastrointestinal disease
- Food intolerance
- Inflammatory bowel disease
- Kidney disease
- Liver disease
- Pancreatic disorders
- Cancer
Repeated vomiting should not simply be treated as a series of unrelated upset stomachs.
What Is Diarrhea in Dogs?
Diarrhea means the dog’s stool is loose, unformed, or watery and/or occurring more frequently than usual.
A dog with diarrhea may:
- Ask to go outside more often
- Have accidents indoors
- Strain while defecating
- Pass mucus
- Produce unusually large amounts of stool
- Have blood in the stool
- Develop staining around the rear end
Diarrhea occurs when the normal digestive process is disrupted. Water and nutrients may not be absorbed normally, while intestinal contents can move through the gastrointestinal tract too quickly.
Like vomiting, diarrhea is a clinical sign rather than a specific diagnosis.
It may be caused by something as straightforward as a food change or stress, but it can also occur with parasites, infections, pancreatitis, inflammatory bowel disease, organ dysfunction, and cancer.
Vomiting vs. Regurgitation
Dog owners sometimes use the words vomiting and regurgitation interchangeably, but they describe different processes.
Vomiting
Vomiting is generally an active process.
A dog may:
- Become restless or nauseated
- Lick its lips or drool
- Retch
- Contract its abdominal muscles
- Forcefully expel stomach contents
Regurgitation
Regurgitation is usually more passive.
It often occurs:
- Shortly after eating or drinking
- Without significant abdominal contractions
- Without the prolonged nausea associated with vomiting
The material may look relatively undigested and can sometimes have a tubular shape because it came from the esophagus.
The distinction matters because regurgitation can point toward an esophageal problem rather than a stomach or intestinal disorder.
If you aren’t sure which one you’re seeing, recording a short video for your veterinarian can be extremely useful.
Why Dogs May Have Both Symptoms at Once
Vomiting affects the upper part of the gastrointestinal tract, while diarrhea primarily involves the intestines. When the digestive system becomes broadly irritated, both can occur together.
Common explanations include:
- Gastrointestinal irritation
- Dietary indiscretion
- Food intolerance
- Infection
- Parasites
- Gastroenteritis
- Pancreatitis
- Toxin exposure
- Foreign-body ingestion
More serious systemic conditions can also produce gastrointestinal symptoms. Kidney or liver disease, for example, may cause vomiting and diarrhea along with changes in appetite, thirst, energy, or body weight.
That is why it is risky to diagnose the cause based only on the appearance of the vomit or stool.
Common Causes of Dog Vomiting and Diarrhea
Dietary Indiscretion
One of the most common explanations is simply eating something the dog shouldn’t have eaten.
Dogs are notorious scavengers. They may raid:
- Garbage cans
- Kitchen counters
- Picnic areas
- Compost bins
- Outdoor trash
- Cat litter
- Another pet’s food
They may also swallow things such as food wrappers, sticks, mulch, or other irritating materials.
A small dietary mistake may result in one or two episodes of vomiting and loose stool before the dog returns to normal. However, dietary indiscretion can also lead to pancreatitis or an intestinal obstruction, particularly when the dog eats fatty foods, bones, packaging, or non-food objects.
Sudden Food Changes
Changing a dog’s food too quickly can disrupt the gastrointestinal system.
For example, problems may occur after:
- Switching brands overnight
- Introducing a new protein
- Adding several new treats
- Changing from puppy to adult food abruptly
- Giving unfamiliar table foods
- Introducing new supplements
A gradual transition is usually easier on the digestive system.
If diarrhea begins immediately after a food change, the new diet may be contributing. But persistent vomiting or diarrhea should not automatically be blamed on the food, especially if other symptoms develop.
Food Intolerance or Food Allergy
Some dogs don’t tolerate particular ingredients well.
Digestive signs may include:
- Recurrent diarrhea
- Vomiting
- Gas
- Abdominal discomfort
- Changes in appetite
Food allergies can also involve skin-related symptoms such as itching or recurrent ear problems.
A dog with occasional digestive upset does not necessarily have a food allergy. Proper diagnosis often requires a veterinarian-guided dietary evaluation rather than repeatedly switching foods.
Stress and Anxiety
Stress can affect the gastrointestinal system just as it can affect other body systems.
Potential triggers include:
- Boarding
- Travel
- Moving house
- Fireworks
- New people
- New pets
- Changes in routine
- Veterinary visits
- Separation from an owner
Some dogs develop loose stool during stressful situations and return to normal once the trigger disappears.
However, stress should not become a default explanation for persistent vomiting and diarrhea. Medical causes should be considered when symptoms are severe, recurrent, or accompanied by other warning signs.
Parasites
Intestinal parasites are another important cause of digestive problems.
Potential parasites include:
- Giardia
- Roundworms
- Hookworms
- Whipworms
- Coccidia
- Tapeworms
Parasites can cause diarrhea, vomiting, weight loss, poor appetite, abdominal discomfort, or poor body condition.
Some dogs may have relatively mild symptoms, while others can become significantly ill.
A veterinarian may recommend a fecal examination when parasites are suspected. Stool testing can help identify organisms that cannot reliably be diagnosed simply by looking at the dog’s stool.
Viral Infections
Viral infections can cause vomiting and diarrhea, particularly in puppies and dogs that are not adequately vaccinated.
One of the most important examples is canine parvovirus.
Parvovirus can cause:
- Severe vomiting
- Severe diarrhea
- Bloody stool
- Loss of appetite
- Weakness
- Dehydration
- Fever
Young or incompletely vaccinated puppies are particularly vulnerable.
Merck Veterinary Manual notes that canine parvovirus can progress to vomiting and bloody diarrhea and may cause severe illness requiring urgent treatment.
If a puppy develops vomiting and diarrhea, particularly when vaccination is incomplete, contact a veterinarian rather than waiting several days to see whether it improves.
Bacterial Infections
Some bacterial infections can affect the gastrointestinal tract and cause vomiting or diarrhea.
Potential organisms include:
- Salmonella
- Campylobacter
- Certain Clostridium species
- Other gastrointestinal bacteria
The presence of bacteria does not automatically mean antibiotics are required.
Veterinarians determine treatment based on the dog’s clinical condition, diagnostic findings, and suspected cause. Unnecessary antibiotics can create additional problems, including gastrointestinal disturbances and antimicrobial resistance.
Pancreatitis
Pancreatitis is inflammation of the pancreas and can cause significant gastrointestinal symptoms.
Possible signs include:
- Vomiting
- Diarrhea
- Loss of appetite
- Lethargy
- Abdominal pain
- Reluctance to move
- A hunched or uncomfortable posture
In some dogs, eating unusually rich or fatty food can contribute to an episode.
Pancreatitis can range from mild to life-threatening, so a dog with persistent vomiting, abdominal pain, weakness, or significant appetite loss should be evaluated rather than treated repeatedly at home.
Foreign Body or Intestinal Blockage
A swallowed object can become lodged in the stomach or intestines.
Common examples include:
- Toys
- Socks
- Bones
- Rocks
- Plastic
- Fabric
- String
- Food wrappers
An obstruction can cause:
- Repeated vomiting
- Loss of appetite
- Abdominal pain
- Diarrhea or inability to pass normal stool
- Lethargy
- Dehydration
- Repeated unproductive retching
This is one of the situations where waiting at home can be dangerous.
If you know or strongly suspect your dog swallowed a foreign object, contact a veterinarian promptly. Some obstructions require endoscopy or surgery.
Poisoning or Toxic Exposure
Vomiting and diarrhea can occur after exposure to many toxic substances.
Potential hazards include:
- Chocolate
- Xylitol
- Human medications
- Rodenticides
- Insecticides
- Cleaning products
- Toxic plants
- Cannabis products
- Alcohol
- Certain household chemicals
If you suspect your dog has eaten something toxic, don’t wait for symptoms to become severe.
Remove the dog from the substance, keep the packaging or label, determine what may have been consumed, and contact a veterinarian or appropriate animal poison-control service.
Do not attempt to induce vomiting or give home remedies unless a veterinary professional specifically tells you to do so. The correct treatment depends heavily on the substance involved.
Gastroenteritis
Gastroenteritis means inflammation involving the stomach and intestines.
It can result from:
- Dietary indiscretion
- New foods
- Bacteria
- Viruses
- Parasites
- Certain medications
- Other irritants
Typical signs include:
- Vomiting
- Diarrhea
- Reduced appetite
- Lethargy
- Abdominal discomfort
VCA notes that gastroenteritis is often a diagnosis of exclusion, meaning veterinarians may first need to rule out more serious causes such as obstruction, toxins, pancreatitis, or organ disease.
Treatment commonly focuses on restoring hydration and electrolyte balance while addressing the underlying cause.
Inflammatory Bowel Disease
Dogs with chronic or recurrent gastrointestinal problems may have an inflammatory intestinal disorder.
Possible signs include:
- Repeated vomiting
- Chronic diarrhea
- Weight loss
- Appetite changes
- Poor body condition
- Recurrent abdominal discomfort
Unlike a simple one-day stomach upset, chronic gastrointestinal disease often requires diagnostic testing and a longer-term treatment plan.
Kidney Disease
Kidney problems can produce gastrointestinal signs because waste products accumulate in the bloodstream when kidney function is impaired.
Possible signs include:
- Vomiting
- Diarrhea
- Increased thirst
- Increased urination
- Reduced appetite
- Weight loss
- Lethargy
A dog with recurrent gastrointestinal symptoms plus noticeable changes in thirst, urination, or body weight should receive veterinary assessment.
Liver Disease
Liver disorders can also cause digestive symptoms.
A dog with liver disease may develop:
- Vomiting
- Diarrhea
- Reduced appetite
- Weight loss
- Lethargy
- Increased thirst or urination
- Jaundice in some cases
Because liver disease can have many causes, diagnostic testing is generally necessary to determine what is happening.
Cancer and Other Systemic Diseases
Persistent vomiting and diarrhea can occasionally be signs of systemic disease or cancer.
This becomes more concerning when gastrointestinal symptoms occur alongside:
- Progressive weight loss
- Chronic poor appetite
- Weakness
- Abdominal enlargement
- Persistent lethargy
- Recurrent vomiting
- Chronic diarrhea
The key point is that ongoing gastrointestinal symptoms deserve investigation. Repeatedly treating episodes as ordinary stomach upset can delay diagnosis of an underlying condition.
Dog Vomiting and Diarrhea After Eating Something Bad
Why Dogs Eat Things They Shouldn’t
Dogs explore the world with their mouths. Unfortunately, that can lead them to consume things that are irritating, indigestible, or poisonous.
A dog may eat:
- Leftovers
- Garbage
- Spoiled food
- Bones
- Wrappers
- Plants
- Human medications
- Household chemicals
- Another animal’s food
Sometimes the result is only temporary stomach upset. Other times, the swallowed material can cause toxicity, pancreatitis, or intestinal obstruction.
Garbage and Spoiled Food
Garbage can contain several hazards at once.
A trash can might contain:
- Fatty meat scraps
- Moldy food
- Bones
- Food wrappers
- Medication
- Cleaning products
- Sharp objects
If your dog develops vomiting and diarrhea after getting into the trash, monitor closely and consider what exactly may have been consumed.
If you find evidence of a potentially dangerous ingestion, contact your veterinarian rather than assuming it is simply an upset stomach.
Human Food
Some human foods are relatively safe in small quantities, while others can be dangerous.
Particular concerns include:
- Chocolate
- Grapes and raisins
- Onions
- Garlic
- Xylitol
- Alcohol
- Caffeine
- Very fatty foods
A dog that consumes a toxic food may require treatment even if it initially appears completely normal.
Fatty Foods
Fatty table scraps can cause gastrointestinal upset and may contribute to pancreatitis in susceptible dogs.
Avoid intentionally giving dogs:
- Greasy meat
- Fried foods
- Fat trimmings
- Heavy sauces
- Large quantities of leftovers
If vomiting and abdominal pain develop after a particularly rich meal, veterinary advice may be appropriate.
Bones and Food Scraps
Cooked bones can splinter and cause gastrointestinal injury or obstruction.
Food scraps may also contain:
- Sharp bones
- Wrappers
- Skewers
- Toothpicks
- String
- Excessive fat
A dog that has swallowed a potentially dangerous object should not be given random home treatments in an attempt to make it pass.
Toxic Foods
Some common foods are especially dangerous for dogs.
Chocolate
Chocolate contains methylxanthines such as theobromine and caffeine. Risk varies according to the type and amount consumed and the dog’s size.
Grapes and Raisins
Grapes and raisins can cause serious illness in dogs, including acute kidney injury.
Onions and Garlic
These foods can damage red blood cells and may cause anemia, particularly after sufficient exposure.
Xylitol
Xylitol is a sweetener found in some sugar-free products and can cause dangerous hypoglycemia and potentially liver injury in dogs.
Alcohol
Alcohol can cause central nervous system depression and other serious effects.
Caffeine
Caffeine can affect the cardiovascular and nervous systems.
What to Do If You Suspect Poisoning
If your dog may have consumed something toxic:
- Remove access to the substance.
- Keep the packaging or ingredient list.
- Determine what product was involved.
- Estimate how much may have been consumed.
- Note approximately when ingestion occurred.
- Contact your veterinarian or an animal poison-control service.
- Follow the professional’s instructions carefully.
- Do not induce vomiting unless specifically instructed.
Avoid relying on internet remedies because some substances can cause significantly more damage if the dog vomits.
How Serious Are Vomiting and Diarrhea in Dogs?
The severity depends on the frequency of symptoms, duration, underlying cause, age of the dog, hydration status, and other clinical signs.
Mild Digestive Upset
Signs that may suggest a less serious episode include:
- One isolated vomiting episode
- Mild diarrhea
- Normal energy
- Normal behavior
- Drinking normally
- No obvious abdominal pain
- No blood in vomit or stool
An otherwise healthy adult dog that has a single episode and quickly returns to normal may sometimes be watched carefully at home.
However, mild symptoms should be treated as something to monitor, not something to automatically ignore.
Moderate Symptoms
More concerning signs include:
- Repeated diarrhea
- Several vomiting episodes
- Reduced appetite
- Mild lethargy
- Increased thirst
- Early signs of dehydration
At this point, contacting your veterinarian for advice is sensible, particularly if the dog is young, elderly, very small, or has another medical condition.
Severe Symptoms
Severe signs include:
- Blood in vomit
- Bloody diarrhea
- Black or tarry stool
- Persistent vomiting
- Severe abdominal pain
- Collapse
- Extreme lethargy
- Difficulty breathing
- Seizures
- Pale or white gums
- Severe weakness
- Repeated unproductive retching
These signs can indicate a potentially serious medical problem and should not be managed solely with home remedies.
When Is Dog Vomiting and Diarrhea an Emergency?
Seek urgent veterinary care when vomiting and diarrhea are accompanied by serious warning signs.
These include:
- Repeated vomiting
- Vomiting that will not stop
- Blood in vomit
- Coffee-ground-like vomit
- Bloody diarrhea
- Black, tarry stool
- Severe lethargy
- Collapse
- Severe abdominal pain
- A swollen or distended abdomen
- Repeated unproductive retching
- Difficulty breathing
- Seizures
- Suspected poisoning
- Suspected foreign-body ingestion
- Inability to keep water down
VCA specifically identifies persistent vomiting or diarrhea, blood, weakness, and severe illness as reasons for veterinary attention, while repeated unproductive attempts to vomit combined with abdominal distension can represent an emergency such as gastric dilatation-volvulus.
When in doubt, call your veterinarian. It is much safer to ask whether a situation requires examination than to wait until dehydration or another complication develops.
Dog Vomiting and Diarrhea With Blood
Blood changes the situation significantly.
What Does Blood in Vomit Mean?
Blood in vomit can appear as:
- Bright red streaks
- Red liquid
- Dark brown material
- Coffee-ground-like material
Fresh red blood may indicate recent bleeding, while a coffee-ground appearance can represent partially digested blood.
Cornell advises veterinary attention when vomit contains blood or material resembling coffee grounds, particularly when other signs such as lethargy, abdominal pain, fever, or prolonged vomiting are present.
What Does Blood in Diarrhea Mean?
Blood in stool may appear as:
- Bright red blood
- Red streaks
- Blood mixed with mucus
- Dark or black stool
Bright red blood often originates farther down the gastrointestinal tract, while black, tarry stool can indicate digested blood from higher in the digestive tract.
Color alone cannot establish the diagnosis, but blood should never be casually dismissed.
When Bloody Diarrhea Is an Emergency
Seek prompt veterinary care when bloody diarrhea is accompanied by:
- Vomiting
- Significant weakness
- Lethargy
- Pale gums
- Abdominal pain
- Collapse
- Large amounts of blood
- Repeated bloody stools
- Dehydration
Puppies with bloody diarrhea deserve particular caution because serious infections such as parvovirus can cause severe gastrointestinal disease.
Dog Vomiting and Diarrhea With Other Symptoms
Vomiting, Diarrhea, and Lethargy
A dog that is vomiting and having diarrhea but remains bright is different from one that becomes noticeably lethargic.
Lethargy may reflect:
- Dehydration
- Infection
- Pain
- Electrolyte disturbances
- Toxin exposure
- Systemic illness
If your dog’s energy level is dropping as gastrointestinal symptoms continue, contact a veterinarian.
Vomiting, Diarrhea, and Loss of Appetite
A temporary decrease in appetite can occur with nausea.
However, complete refusal to eat becomes more concerning when it persists or occurs with:
- Repeated vomiting
- Severe diarrhea
- Pain
- Weakness
- Fever
- Dehydration
Puppies and dogs with chronic medical conditions may need assessment sooner.
Vomiting, Diarrhea, and Abdominal Pain
Abdominal pain can occur with gastroenteritis, but it can also signal more serious conditions such as:
- Pancreatitis
- Foreign-body obstruction
- Severe gastrointestinal inflammation
- Gastric dilatation-volvulus
- Other abdominal disorders
A dog with vomiting, diarrhea, and significant abdominal pain should be assessed promptly.
Vomiting, Diarrhea, and Fever
Fever can occur with infections or inflammation.
Because dogs can develop gastrointestinal symptoms from many different causes, fever combined with vomiting and diarrhea should be discussed with a veterinarian, especially if the dog is also lethargic or not eating.
Vomiting, Diarrhea, and Shaking
Shaking can have several explanations, including:
- Pain
- Nausea
- Fever
- Anxiety
- Toxin exposure
- Low blood sugar
- Other systemic problems
If shaking is severe, persistent, or occurs alongside weakness, seizures, collapse, or suspected poisoning, seek urgent veterinary attention.
Vomiting, Diarrhea, and Excessive Thirst
Excessive thirst may occur when a dog is trying to replace fluids lost through vomiting and diarrhea.
However, increased thirst can also accompany conditions such as:
- Kidney disease
- Certain metabolic disorders
- Diabetes
- Dehydration
If unusual thirst continues after the gastrointestinal symptoms improve, mention it to your veterinarian.
Signs of Dehydration in Dogs
Why Vomiting and Diarrhea Cause Dehydration
The gastrointestinal tract normally absorbs water and electrolytes. With diarrhea, intestinal contents can move through too quickly, allowing more fluid to leave the body.
Vomiting adds another source of fluid loss.
That’s why vomiting plus diarrhea can accelerate dehydration. Cornell notes that this combination can lead to electrolyte disturbances, place additional stress on the kidneys, and become potentially life-threatening if severe.
Common Signs of Dehydration
Possible signs include:
- Dry or tacky gums
- Weakness
- Lethargy
- Reduced appetite
- Reduced skin elasticity
- Sunken-looking eyes in severe cases
Don’t rely on a single home test to determine whether your dog is dehydrated. Veterinary assessment is more reliable, especially when vomiting continues.
Which Dogs Dehydrate Faster?
Extra caution is appropriate with:
- Puppies
- Small breeds
- Senior dogs
- Dogs with kidney disease
- Dogs with liver disease
- Dogs with diabetes
- Dogs with other chronic conditions
- Dogs experiencing frequent vomiting
- Dogs with severe watery diarrhea
A small dog can lose a significant proportion of its body fluid through repeated vomiting and diarrhea.
Dog Vomiting and Diarrhea in Puppies
Why Puppies Are More Vulnerable
Puppies have smaller bodies and may have less reserve when they become dehydrated or stop eating.
Vomiting and diarrhea can therefore become serious more quickly than in a healthy adult dog.
Parvovirus Risk
Canine parvovirus deserves special attention in puppies.
Possible signs include:
- Vomiting
- Severe diarrhea
- Bloody stool
- Loss of appetite
- Lethargy
- Weakness
- Dehydration
Unvaccinated or incompletely vaccinated puppies are at particular risk.
Parasites
Puppies can also develop gastrointestinal problems from parasites such as:
- Roundworms
- Hookworms
- Giardia
- Coccidia
Routine veterinary care and appropriate parasite prevention are important during puppyhood.
Low Blood Sugar
Very young or tiny puppies may be vulnerable to low blood glucose when they stop eating, particularly when illness is causing additional stress on the body.
This is another reason not to assume that vomiting and diarrhea in a puppy can safely be managed at home for several days.
When a Vomiting Puppy Needs Immediate Veterinary Care
Contact a veterinarian promptly if a puppy has:
- Repeated vomiting
- Diarrhea combined with vomiting
- Bloody stool
- Significant lethargy
- Weakness
- Refusal to eat
- Inability to keep water down
- Fever
- Incomplete vaccinations
- Suspected toxin exposure
- Possible foreign-body ingestion
Dog Vomiting and Diarrhea in Senior Dogs
Common Causes in Older Dogs
Older dogs can experience the same dietary and infectious problems as younger dogs, but they may also have chronic conditions that affect digestion.
Potential causes include:
- Kidney disease
- Liver disease
- Pancreatitis
- Medication effects
- Chronic gastrointestinal disease
- Cancer
Why Senior Dogs Need Closer Monitoring
Senior dogs may have:
- Less physiological reserve
- Existing medical conditions
- Multiple medications
- Increased susceptibility to dehydration
- Greater risk of complications
A senior dog with persistent vomiting and diarrhea deserves a lower threshold for veterinary evaluation.
Dog Vomiting and Diarrhea by Breed or Size
Small Dogs
Small dogs can become dehydrated relatively quickly because they have less total body fluid.
Extra caution is appropriate when a small dog:
- Vomits repeatedly
- Has frequent watery diarrhea
- Stops drinking
- Becomes weak
- Cannot keep fluids down
Large Dogs
Large dogs can experience gastrointestinal problems for the same reasons as smaller dogs, but owners should also be alert to signs of gastric dilatation-volvulus (GDV).
Repeated unproductive retching, abdominal distension, weakness, or collapse is an emergency.
Brachycephalic Dogs
Brachycephalic breeds include:
- Pugs
- Bulldogs
- French Bulldogs
- Boston Terriers
- Shih Tzus
Dogs with shortened airways may have additional respiratory considerations when they become ill or are undergoing veterinary procedures.
If a brachycephalic dog develops vomiting and diarrhea alongside breathing difficulty, severe weakness, or collapse, seek emergency veterinary care.
What to Do at Home for Mild Dog Vomiting and Diarrhea
Home monitoring should only be considered when symptoms are mild and the dog is otherwise bright, comfortable, and able to drink.
The goal isn’t to aggressively treat the dog yourself. It is to prevent additional problems while watching carefully for deterioration.
Monitor Your Dog Closely
Keep track of:
- Number of vomiting episodes
- Number of diarrhea episodes
- Appetite
- Water intake
- Energy level
- Stool appearance
- Vomit appearance
- Any signs of pain
- Any possible toxin or foreign-body exposure
Writing these details down can make a veterinary consultation much more useful.
Encourage Appropriate Hydration
Fresh water should generally be available.
However, a dog that is vomiting may drink too quickly and trigger another episode.
Avoid forcing large quantities of water.
If your dog repeatedly vomits after drinking or cannot keep fluids down, contact a veterinarian promptly. VCA specifically warns against forcing food or water in seriously ill dogs.
Feeding After Vomiting
Once vomiting has stopped, a veterinarian may recommend small portions of an easily digestible food.
Depending on the dog’s condition, this could involve:
- A veterinary gastrointestinal diet
- Another veterinarian-recommended easily digestible food
- Small, frequent meals
Avoid immediately offering:
- Fatty foods
- Large meals
- Table scraps
- Rich treats
- Bones
As the dog improves, the normal diet can generally be reintroduced gradually according to veterinary guidance.
Bland Diets
Historically, boiled chicken and white rice have often been suggested for dogs with mild digestive upset.
A bland diet may sometimes be useful for short-term management when a veterinarian considers home care appropriate. However, it is not nutritionally complete enough to replace a balanced dog food for an extended period.
Veterinary gastrointestinal diets can be preferable because they are specifically formulated for digestive support.
If symptoms persist despite dietary management, the priority should shift from repeatedly changing food to finding the underlying cause.
Can I Give My Dog Water After Vomiting?
Why Hydration Matters
Water is important because both vomiting and diarrhea can remove substantial amounts of fluid.
A dog with mild digestive upset should generally have access to fresh water.
Small Amounts vs. Large Amounts
A dog that gulps a large volume immediately after vomiting may trigger another episode.
Instead of encouraging a dog to consume a huge amount at once, monitor drinking behavior and follow veterinary instructions.
What If the Dog Vomits Water?
If your dog repeatedly vomits after drinking, that’s more concerning.
It may mean that the gastrointestinal tract cannot currently tolerate normal fluid intake.
Contact a veterinarian promptly rather than repeatedly offering larger quantities of water.
When Water Intake Requires Veterinary Attention
Seek veterinary advice when:
- Your dog cannot keep water down
- Vomiting repeatedly follows drinking
- The dog becomes weak
- Gums become dry or tacky
- Urination decreases significantly
- Diarrhea is severe
- Other emergency symptoms develop
What Can I Feed a Dog With Vomiting and Diarrhea?
Easily Digestible Foods
For selected mild cases, veterinarians may recommend an easily digestible, low-fat diet.
Small meals are often easier to tolerate than a large meal after vomiting has settled.
Veterinary Gastrointestinal Diets
Prescription gastrointestinal diets are designed to provide appropriate nutrition while being relatively easy to digest.
Depending on the situation, your veterinarian may recommend one of these diets rather than a homemade bland diet.
Small Frequent Meals
Once vomiting has stopped, several small meals may be easier to tolerate than one large serving.
The amount and feeding schedule should depend on:
- Dog size
- Age
- Medical history
- Severity of symptoms
- Veterinary recommendations
When to Resume Normal Food
As symptoms improve, normal food can generally be reintroduced gradually rather than switching immediately from a bland diet to a full normal meal.
VCA notes that dogs recovering from uncomplicated diarrhea are often transitioned back to their regular diet gradually once stools normalize.
Foods to Avoid
During digestive upset, avoid:
- Fatty foods
- Table scraps
- Rich treats
- Spicy foods
- Bones
- Large meals
- Foods known to trigger your dog’s intolerance
Should You Withhold Food From a Vomiting Dog?
Older advice sometimes recommended prolonged fasting, but feeding recommendations depend on the individual dog and the underlying problem.
A veterinarian may recommend a short temporary food break in certain situations, followed by small portions of easily digestible food.
However, prolonged fasting is not appropriate for every dog.
Puppies Need Special Consideration
Puppies have different nutritional and metabolic needs. A vomiting puppy should not simply be fasted for an extended period without veterinary guidance.
Diabetic Dogs Require Extra Caution
Dogs with diabetes may require carefully coordinated food and medication schedules.
If a diabetic dog stops eating and is vomiting or has diarrhea, contact your veterinarian promptly.
Don’t Fast Without Advice When:
- Your dog is a puppy
- Your dog is elderly or medically fragile
- Your dog has diabetes
- Your dog takes important medications
- Your dog is severely ill
- Vomiting is persistent
- Dehydration is suspected
When in doubt, ask your veterinarian before changing your dog’s feeding schedule.
Can Dogs Take Human Medicine for Vomiting or Diarrhea?
Why Human Medications Can Be Dangerous
It’s tempting to reach for something in the medicine cabinet when a dog has diarrhea or vomiting.
That can be dangerous.
Dogs metabolize medications differently from humans, and some human drugs can cause toxicity or interact with medications your dog is already taking.
Do not give human medication unless your veterinarian specifically tells you to use it.
Pepto-Bismol
Pepto-Bismol contains bismuth subsalicylate.
Although it is sometimes discussed as a home treatment for diarrhea, Cornell specifically advises against giving medications such as Pepto-Bismol without veterinary direction because they can be harmful to certain dogs or interact with other medications.
Imodium/Loperamide
Loperamide is another medication that should not be given casually.
Certain dogs may be at increased risk of adverse effects, and diarrhea caused by obstruction, toxins, or infection needs a different approach.
Always consult your veterinarian first.
Pain Relievers
Human painkillers are particularly dangerous to give without veterinary advice.
Never assume that a medication safe for people is safe for dogs.
Anti-Nausea Medications
Veterinarians have prescription medications that can control nausea and vomiting when appropriate.
The right medication depends on the cause and the dog’s condition.
For example, vomiting caused by an obstruction should not simply be suppressed without addressing the obstruction.
Probiotics for Dogs With Diarrhea
What Are Canine Probiotics?
Probiotics contain beneficial microorganisms intended to support the gastrointestinal microbiome.
They may be recommended in certain dogs with diarrhea, especially when gastrointestinal disruption is mild or associated with dietary changes.
How Probiotics May Support Gut Health
Potential benefits may include supporting:
- Normal intestinal bacteria
- Digestive function
- Stool consistency
- Recovery after gastrointestinal disturbance
However, probiotics are supportive products, not universal treatments.
When Veterinarians May Recommend Them
A veterinarian may consider a canine probiotic when:
- Diarrhea is mild
- The dog is otherwise stable
- Dietary upset is suspected
- The gut microbiome may have been disrupted
The recommendation depends on the individual dog.
Choosing a Veterinary-Formulated Product
Not every probiotic marketed for pets has the same formulation or evidence behind it.
Ask your veterinarian about:
- Appropriate strains
- Dosage
- Product quality
- Duration of use
- Whether a probiotic is appropriate for your dog’s particular illness
Most importantly, don’t use a probiotic as a reason to delay veterinary care when vomiting and diarrhea are severe or persistent.
How Serious Are Vomiting and Diarrhea in Dogs?
Not every episode of vomiting and diarrhea means your dog has a serious illness. Dogs occasionally develop an upset stomach after eating something unusual, getting into the trash, eating too quickly, or experiencing a stressful change.
The important question is how your dog looks and behaves overall.
A healthy adult dog that vomits once and has one loose stool but remains alert, comfortable, and interested in water may be suitable for close monitoring. However, repeated vomiting and diarrhea can quickly become more concerning.
Mild Digestive Upset
A mild episode may involve:
- One isolated vomiting episode
- A small number of loose stools
- Normal energy
- Normal behavior
- Normal drinking
- No obvious abdominal pain
- No blood in vomit or stool
Even in these situations, monitor your dog carefully because mild gastrointestinal upset can sometimes progress.
Moderate Symptoms
Veterinary advice becomes more important when you notice:
- Several episodes of diarrhea
- Repeated vomiting
- Reduced appetite
- Mild lethargy
- Increased thirst
- Signs of dehydration
- Continued stomach discomfort
Severe Symptoms
More serious warning signs include:
- Blood in vomit
- Bloody diarrhea
- Black, tarry stool
- Persistent vomiting
- Severe abdominal pain
- Collapse
- Extreme weakness
- Pale or white gums
- Swollen abdomen
- Difficulty breathing
- Seizures
Vomiting and diarrhea occurring together deserve extra attention because your dog is losing fluids through both the stomach and intestines.
When Is Dog Vomiting and Diarrhea an Emergency?
Some combinations of symptoms should be treated as an emergency rather than watched at home.
Seek urgent veterinary care if your dog has:
- Repeated vomiting
- Vomiting that won’t stop
- Blood in vomit
- Vomit resembling coffee grounds
- Bloody diarrhea
- Black or tarry stool
- Severe lethargy
- Collapse
- Severe abdominal pain
- A swollen or painful abdomen
- Repeated unproductive retching
- Difficulty breathing
- Seizures
- Suspected poisoning
- Suspected foreign-body ingestion
- Inability to keep water down
One particularly important emergency sign is repeated retching without producing vomit, especially when the abdomen appears swollen. This can occur with gastric dilatation-volvulus (GDV), commonly called bloat, which requires immediate veterinary treatment.
Dog Vomiting and Diarrhea With Blood
Seeing blood can be alarming, but the appearance and amount of blood can provide useful information.
What Does Blood in Vomit Mean?
Fresh blood may appear:
- Bright red
- Pink or streaked through mucus
- Dark red
- Brown or coffee-ground-like
Fresh blood can result from irritation of the mouth, throat, esophagus, or stomach. Dark material resembling coffee grounds can represent partially digested blood.
Blood should never be dismissed simply because your dog otherwise appears normal.
What Does Blood in Diarrhea Mean?
Bright red blood generally indicates bleeding somewhere in the lower digestive tract, although appearance alone cannot determine the exact source.
You may also see:
- Bright red streaks
- Blood mixed with mucus
- Red liquid stool
- Dark or black stool
Black, tarry stool can indicate digested blood and requires prompt veterinary attention.
When Bloody Diarrhea Is an Emergency
Bloody diarrhea becomes especially concerning when it occurs with:
- Vomiting
- Weakness
- Pale gums
- Severe lethargy
- Abdominal pain
- Dehydration
- Collapse
- Large amounts of blood
Puppies with bloody diarrhea deserve particular attention because serious infectious diseases, including canine parvovirus, can cause severe gastrointestinal illness.
Dog Vomiting and Diarrhea With Other Symptoms
The symptoms that accompany vomiting and diarrhea can help determine how urgently your dog needs veterinary care.
Vomiting, Diarrhea, and Lethargy
A tired dog may simply be exhausted after losing fluids, but lethargy can also indicate:
- Dehydration
- Infection
- Pain
- Toxin exposure
- Pancreatitis
- Systemic disease
A dog that becomes progressively weaker should be evaluated promptly.
Vomiting, Diarrhea, and Loss of Appetite
Temporary appetite loss can accompany an upset stomach.
However, refusal to eat becomes more concerning when it lasts, occurs with repeated vomiting, or is accompanied by weakness or pain.
Puppies and dogs with conditions such as diabetes require additional caution because prolonged food refusal can have more serious consequences.
Vomiting, Diarrhea, and Abdominal Pain
Abdominal pain can occur with gastroenteritis, but it can also be associated with:
- Pancreatitis
- Intestinal obstruction
- Foreign bodies
- Severe inflammation
- Gastric dilatation-volvulus
- Other abdominal diseases
Signs of abdominal pain may include restlessness, whining, a hunched posture, reluctance to move, or repeatedly changing positions.
Vomiting, Diarrhea, and Fever
Fever may occur with infections or inflammatory conditions.
Because body temperature cannot reliably be judged by touching a dog’s nose, a veterinarian may need to measure your dog’s temperature.
Vomiting, Diarrhea, and Shaking
Shaking can occur because of:
- Nausea
- Pain
- Fever
- Anxiety
- Toxin exposure
- Low blood sugar
- Neurological problems
When shaking occurs alongside severe vomiting, weakness, collapse, or suspected poisoning, seek veterinary attention.
Signs of Dehydration in Dogs
One of the biggest concerns with simultaneous vomiting and diarrhea is dehydration.
Your dog can lose significant amounts of water and electrolytes while also drinking less because of nausea.
Common Signs of Dehydration
Watch for:
- Dry or tacky gums
- Weakness
- Lethargy
- Reduced appetite
- Reduced skin elasticity
- Sunken-looking eyes in more severe cases
- Reduced urine production
A dog’s gums should normally feel moist rather than unusually sticky or dry.
However, home checks cannot accurately determine the degree of dehydration in every dog.
Which Dogs Dehydrate Faster?
Extra caution is needed with:
- Puppies
- Small breeds
- Senior dogs
- Dogs with kidney disease
- Dogs with liver disease
- Dogs with diabetes
- Dogs with chronic gastrointestinal problems
- Dogs experiencing frequent vomiting
- Dogs with severe diarrhea
Small dogs can lose a significant proportion of their body fluids relatively quickly because of their lower body weight.
Dog Vomiting and Diarrhea in Puppies
Puppies deserve a much lower threshold for veterinary evaluation.
Their immune systems are still developing, they have smaller energy reserves, and they can become dehydrated or weak more quickly than healthy adult dogs.
Common Causes in Puppies
Potential causes include:
- Dietary changes
- Parasites
- Eating inappropriate objects
- Stress
- Bacterial infections
- Viral infections
- Canine parvovirus
Parvovirus Risk
Parvovirus is particularly important in young, unvaccinated, or incompletely vaccinated dogs.
It can cause:
- Severe vomiting
- Profuse diarrhea
- Bloody stool
- Loss of appetite
- Depression
- Dehydration
- Weakness
If a puppy develops vomiting and diarrhea and its vaccination series is incomplete, contact a veterinarian promptly.
Puppy Vomiting and Diarrhea: When to Act
Don’t wait at home if a puppy:
- Vomits repeatedly
- Develops bloody diarrhea
- Refuses food
- Refuses water
- Becomes weak
- Becomes unusually sleepy
- Has repeated watery diarrhea
- May have swallowed an object
- May have been exposed to a toxin
Dog Vomiting and Diarrhea in Senior Dogs
Older dogs may have less physiological reserve and are more likely to have underlying conditions that complicate gastrointestinal symptoms.
Possible Causes in Senior Dogs
These include:
- Kidney disease
- Liver disease
- Pancreatitis
- Medication side effects
- Chronic gastrointestinal disease
- Cancer
- Dental or oral disease affecting eating
- Metabolic disorders
A senior dog with repeated vomiting and diarrhea should generally receive veterinary advice sooner rather than later.
Dog Vomiting and Diarrhea by Breed or Size
The underlying cause is usually more important than breed, but body size and breed characteristics can influence risk.
Small Dogs
Small dogs may become dehydrated more rapidly during prolonged gastrointestinal illness.
Young toy-breed puppies can also be vulnerable to low blood sugar if they stop eating.
Large Dogs
Large and deep-chested dogs have an important additional concern: GDV or bloat.
Repeated unproductive retching combined with abdominal enlargement is an emergency.
Brachycephalic Dogs
Flat-faced breeds such as:
- Pugs
- Bulldogs
- French Bulldogs
- Boston Terriers
- Shih Tzus
can have airway-related concerns that may influence how veterinarians approach vomiting, sedation, and aspiration risk.
What to Do at Home for Mild Dog Vomiting and Diarrhea
Home monitoring should only be considered when symptoms are mild, the dog is otherwise bright and comfortable, and there are no major warning signs.
Monitor Your Dog Closely
Keep track of:
| What to Monitor | What to Record |
|---|---|
| Vomiting | Number of episodes |
| Diarrhea | Number and severity |
| Vomit | Color and contents |
| Stool | Color, mucus, blood |
| Appetite | Normal or reduced |
| Water | Drinking normally or not |
| Energy | Normal or lethargic |
| Pain | Any signs of discomfort |
| Possible exposure | Food, toxin, object |
| Duration | Hours or days |
This information can be extremely useful if you eventually need to call your veterinarian.
Can I Give My Dog Water After Vomiting?
Water is important, but a dog that is actively vomiting may not tolerate a large amount at once.
Allowing a dog to gulp a large bowl of water immediately after vomiting can sometimes trigger another episode.
Instead:
- Keep fresh water available.
- Avoid encouraging your dog to drink huge amounts at once.
- Monitor whether small amounts remain down.
- Contact your veterinarian if vomiting continues.
- Seek care if your dog cannot retain fluids.
If your dog repeatedly vomits after drinking, don’t continue experimenting with home hydration strategies. Veterinary assessment may be necessary.
What Can I Feed a Dog With Vomiting and Diarrhea?
Once vomiting has stopped and your veterinarian agrees that home care is appropriate, food may be reintroduced gradually.
Easily Digestible Foods
A veterinarian may recommend an easily digestible gastrointestinal diet.
These diets are designed to be gentle on the digestive tract while providing appropriate nutrition.
Small, Frequent Meals
Instead of immediately offering a normal-sized meal, small portions may be easier to tolerate.
The amount and timing should depend on your dog’s condition and veterinary advice.
Foods to Avoid
During recovery, avoid:
- Fatty foods
- Table scraps
- Rich treats
- Spicy foods
- Bones
- Large meals
- Unfamiliar foods
A homemade bland diet may sometimes be recommended for short-term use, but it is not nutritionally complete enough to serve as a long-term diet unless formulated appropriately.
Should You Withhold Food From a Vomiting Dog?
Older advice often recommended prolonged fasting for gastrointestinal problems, but modern veterinary management is more individualized.
Some dogs may benefit from a brief adjustment to food intake, while others should not be fasted without professional guidance.
Puppies Need Special Consideration
Young puppies can become weak or develop low blood sugar when they stop eating.
Diabetic Dogs Need Extra Caution
A diabetic dog that refuses food while receiving medication can face serious complications.
Never assume that fasting is appropriate simply because a dog is vomiting.
When in doubt, ask your veterinarian for specific feeding instructions.
Can Dogs Take Human Medicine for Vomiting or Diarrhea?
This is one of the most common mistakes dog owners make.
Do not give human medications to your dog unless a veterinarian specifically tells you to do so.
Pepto-Bismol
Bismuth-containing products may sometimes be used in veterinary medicine, but dosing and suitability depend on the individual dog.
Some formulations may contain ingredients that are inappropriate for certain pets.
Imodium or Loperamide
Loperamide isn’t appropriate for every dog and can be risky in certain breeds or medical conditions.
Human Pain Relievers
Never casually give medications such as:
- Ibuprofen
- Naproxen
- Acetaminophen
- Aspirin
Some can cause serious gastrointestinal, kidney, liver, or other toxicity.
Anti-Nausea Medication
Veterinarians have medications specifically designed to control nausea and vomiting in dogs.
The correct choice depends on the suspected cause.
Probiotics for Dogs With Diarrhea
Probiotics are products containing beneficial microorganisms intended to support the intestinal microbiome.
They may be useful in some cases of uncomplicated diarrhea, particularly when recommended by a veterinarian.
What Probiotics May Do
They may help:
- Support normal intestinal bacteria
- Promote digestive health
- Support recovery from certain episodes of diarrhea
However, probiotics don’t treat every cause of vomiting and diarrhea.
They cannot replace treatment for:
- Foreign-body obstruction
- Severe infection
- Poisoning
- Pancreatitis
- Significant dehydration
- Serious systemic disease
Choose a veterinary-formulated probiotic rather than assuming a human supplement is appropriate.
When to Call the Veterinarian
Knowing when to stop monitoring and seek professional help is one of the most important parts of managing gastrointestinal illness.
Call Immediately If:
- Blood is present in vomit
- Blood is present in large amounts in stool
- Your dog collapses
- Your dog has seizures
- Severe abdominal pain occurs
- Your dog has difficulty breathing
- Poisoning is suspected
- A foreign object may have been swallowed
- Your dog’s abdomen becomes swollen
- Your dog repeatedly retches without vomiting
Call Promptly If:
- Vomiting continues
- Diarrhea becomes severe
- Your dog cannot keep water down
- Your dog refuses food and water
- Your dog becomes unusually tired
- Dehydration is suspected
- Symptoms are worsening instead of improving
Persistent diarrhea also deserves veterinary evaluation. Cornell University College of Veterinary Medicine advises seeking veterinary attention when diarrhea lasts 48–72 hours, or sooner when it occurs with vomiting, lethargy, appetite loss, or black/tarry stool.
How Veterinarians Diagnose Dog Vomiting and Diarrhea
A veterinarian doesn’t diagnose gastrointestinal disease based on vomiting or diarrhea alone.
Instead, they combine the dog’s history, physical examination, symptoms, and diagnostic testing.
Medical History
Expect questions such as:
- What did your dog eat?
- When did vomiting begin?
- How many times has your dog vomited?
- How frequently is your dog having diarrhea?
- What does the stool look like?
- Has the diet recently changed?
- Could your dog have eaten garbage?
- Could your dog have swallowed an object?
- Could there have been toxin exposure?
- Is your dog vaccinated?
- What medications or supplements is your dog taking?
Physical Examination
The veterinarian may evaluate:
- Hydration
- Gum color
- Heart rate
- Respiratory rate
- Temperature
- Abdominal tenderness
- Body condition
- Pain
- General attitude
Fecal Testing
A stool sample may be checked for parasites and other gastrointestinal causes.
Common tests may look for organisms such as:
- Giardia
- Roundworms
- Hookworms
- Whipworms
- Coccidia
Blood Tests
Bloodwork can help evaluate:
- Kidney function
- Liver function
- Electrolytes
- Blood glucose
- Hydration-related changes
- Inflammatory changes
- Other systemic abnormalities
Specific pancreatic testing may also be considered when pancreatitis is suspected.
Imaging for Dog Vomiting and Diarrhea
Sometimes the cause cannot be identified through history and physical examination alone.
X-Rays
Radiographs may help identify:
- Foreign objects
- Intestinal obstruction
- Abnormal gas patterns
- Abdominal abnormalities
- Certain types of stones or mineralized material
Not every foreign object is easily visible on a standard X-ray, so additional imaging may be necessary.
Ultrasound
Abdominal ultrasound can provide more detailed information about:
- Intestinal walls
- Stomach
- Pancreas
- Liver
- Gallbladder
- Lymph nodes
- Abdominal fluid
- Some foreign bodies
The veterinarian will decide which diagnostic tests make sense based on the dog’s symptoms.
How Veterinarians Treat Dog Vomiting and Diarrhea
There isn’t one universal treatment.
The goal is to treat the underlying cause while supporting hydration and controlling dangerous symptoms.
Fluid Therapy
Depending on severity, fluid support may include:
- Oral fluids
- Subcutaneous fluids
- Intravenous fluids
Dogs with significant dehydration or ongoing fluid loss may require IV fluids in a veterinary hospital.
Anti-Vomiting Medication
Veterinarians may prescribe anti-nausea or anti-vomiting medications when appropriate.
Controlling vomiting can help prevent additional fluid loss and allow nutritional support.
Gastrointestinal Diets
Veterinary gastrointestinal diets may be recommended because they are formulated to be digestible and nutritionally appropriate for dogs recovering from digestive illness.
Parasite Treatment
If parasites are identified or strongly suspected, the veterinarian can prescribe the appropriate medication.
Different parasites require different treatments, so randomly giving a dewormer is not always effective.
Antibiotics
Antibiotics are not automatically necessary for vomiting and diarrhea.
Many gastrointestinal episodes are not bacterial infections requiring antibiotics.
A veterinarian may prescribe antibiotics only when there is a specific reason to do so.
Treatment for Pancreatitis
Pancreatitis can range from mild to life-threatening.
Treatment may include:
- IV fluid therapy
- Pain management
- Anti-nausea medication
- Appropriate nutrition
- Monitoring of bloodwork
- Hospitalization in severe cases
Dogs with pancreatitis may require careful dietary management after the acute episode.
Treatment for Foreign-Body Obstruction
If a dog swallows an object and it becomes lodged in the gastrointestinal tract, treatment depends on the location and type of object.
Possible approaches include:
- Careful monitoring in selected cases
- Endoscopy
- Surgery
A suspected obstruction should never be treated as ordinary stomach upset.
Repeated vomiting, abdominal pain, appetite loss, lethargy, and a history of swallowing an object are important warning signs.
How Long Does Dog Vomiting and Diarrhea Last?
The duration varies considerably depending on the underlying cause.
Mild Acute Gastrointestinal Upset
Some uncomplicated cases improve within a day or two with appropriate supportive care.
Infectious Causes
The duration depends on the organism and severity of disease.
Parasites
Symptoms may continue until the underlying parasite is correctly diagnosed and treated.
Pancreatitis
Recovery may be relatively quick in mild cases but considerably longer in severe cases.
Chronic Gastrointestinal Disease
Repeated episodes shouldn’t simply be treated at home over and over.
If vomiting and diarrhea keep returning, the veterinarian may need to investigate an underlying chronic disorder.
Chronic Vomiting and Diarrhea in Dogs
An occasional upset stomach is different from a dog that repeatedly develops gastrointestinal symptoms.
Chronic or recurrent symptoms may involve:
- Food intolerance
- Inflammatory bowel disease
- Parasites
- Pancreatic disorders
- Liver disease
- Kidney disease
- Cancer
- Chronic infection
- Dietary problems
Warning Signs of Chronic Disease
Watch for:
- Gradual weight loss
- Poor coat condition
- Repeated vomiting
- Intermittent diarrhea
- Appetite changes
- Increased thirst
- Reduced energy
- Poor body condition
A dog with recurring gastrointestinal problems deserves a proper veterinary workup rather than repeated cycles of home treatment.
Dog Diarrhea Colors and What They May Mean
Stool color can provide clues, but it cannot diagnose the cause by itself.
Brown Diarrhea
Brown is generally the expected stool color, although unusually watery brown diarrhea can occur with many forms of gastrointestinal upset.
Yellow Diarrhea
Yellow stool can occur with rapid intestinal transit, dietary changes, or gastrointestinal irritation.
Green Diarrhea
Green stool can result from dietary factors, grass consumption, bile, or rapid movement through the digestive tract.
Orange Diarrhea
Orange stool can have several causes, including dietary factors and gastrointestinal changes.
Red or Bloody Diarrhea
Bright red blood can indicate bleeding in the lower digestive tract.
Significant amounts of blood should receive prompt veterinary attention.
Black or Tarry Diarrhea
Black, tarry stool may represent digested blood.
This is more concerning than an ordinary loose brown stool and warrants veterinary evaluation.
What Does Dog Vomit Color Mean?
Vomit color can sometimes provide useful information, but it shouldn’t be interpreted in isolation.
Clear Vomit
May contain stomach fluid or water.
White Foam
Foamy vomit can occur with stomach irritation, nausea, reflux, or an empty stomach.
Yellow Bile
Yellow vomit commonly contains bile.
It can occur when the stomach is empty, although repeated yellow vomiting still warrants attention.
Green Vomit
Green material may represent bile or ingested plant material.
Brown Vomit
Brown vomit may contain food or other material. If it has a distinctly foul or fecal-like appearance, veterinary evaluation is important.
Red or Bloody Vomit
Blood may appear bright red or dark.
Bloody vomit should not be ignored.
Coffee-Ground-Like Vomit
Dark granular material resembling coffee grounds can indicate partially digested blood and requires prompt veterinary attention.
Dog Vomiting and Diarrhea After Changing Food
A sudden diet change is a common cause of gastrointestinal upset.
Dogs have an intestinal microbiome that adapts to their usual diet. Abruptly switching foods can result in:
- Loose stool
- Gas
- Vomiting
- Reduced appetite
- Abdominal discomfort
How to Transition Dog Food
Unless your veterinarian recommends a different approach, food changes are generally best made gradually.
A gradual transition allows the digestive system time to adapt.
The same principle applies when introducing:
- New treats
- New proteins
- Supplements
- Homemade foods
- Different brands
- Puppy-to-adult diets
If vomiting and diarrhea continue despite returning to the usual diet, don’t automatically assume the food change is still responsible.
Dog Vomiting and Diarrhea After Eating Grass
Many dogs eat grass occasionally, and grass consumption does not automatically mean that a dog is sick.
Some dogs may vomit after eating grass because the plant material irritates the stomach.
However, repeated grass eating followed by vomiting and diarrhea may warrant investigation.
Contact your veterinarian if:
- Vomiting is repeated
- Diarrhea is severe
- Your dog becomes lethargic
- Blood appears
- Your dog stops eating
- You suspect the grass was treated with chemicals
Dog Vomiting and Diarrhea After Eating Human Food
Human food is one of the most common sources of dietary indiscretion.
Fatty Foods
High-fat foods can cause gastrointestinal upset and may contribute to pancreatitis in susceptible dogs.
Dairy Products
Some dogs have difficulty digesting lactose and may develop diarrhea or gas after consuming dairy.
Chocolate
Chocolate contains methylxanthines that can be toxic to dogs.
Risk depends on factors such as:
- Type of chocolate
- Amount consumed
- Dog’s body weight
Dark chocolate and cocoa products can be particularly concerning.
Grapes and Raisins
Grapes and raisins can cause serious kidney injury in dogs, and the amount that causes toxicity can be unpredictable.
Any suspected ingestion should be discussed with a veterinarian promptly.
Onions and Garlic
These foods can damage red blood cells and cause anemia in dogs.
Xylitol
Xylitol is an artificial sweetener found in some sugar-free products and can cause dangerous hypoglycemia and other serious effects in dogs.
If your dog eats a potentially toxic food, don’t wait for symptoms before contacting a veterinarian.
Dog Vomiting and Diarrhea From Stress
Stress can affect a dog’s digestive system.
A dog may develop loose stool or vomiting after:
- Traveling
- Boarding
- Moving house
- Fireworks
- Changes in routine
- Meeting unfamiliar people
- Introducing another animal
- Separation from an owner
How Stress Affects Digestion
Stress can influence intestinal movement and the gut-brain connection, potentially leading to changes in stool consistency and appetite.
However, stress should be considered a possible contributor—not an automatic diagnosis.
If vomiting is severe, diarrhea is bloody, or your dog’s energy is declining, seek veterinary advice instead of assuming stress is responsible.
How to Prevent Vomiting and Diarrhea in Dogs
While not every gastrointestinal problem can be prevented, several habits can lower the risk.
Feed a Consistent Diet
Avoid unnecessary changes in food.
Introduce New Foods Gradually
Give your dog’s digestive system time to adjust.
Limit Table Scraps
Human foods can be fatty, unfamiliar, or toxic.
Prevent Garbage Eating
Use secure trash cans and don’t leave food waste within reach.
Keep Toxic Foods Away
Store chocolate, xylitol-containing products, medications, alcohol, grapes, raisins, onions, and other dangerous substances securely.
Maintain Parasite Prevention
Follow your veterinarian’s recommendations for parasite prevention and screening.
Keep Vaccinations Current
Vaccination is especially important for preventing serious infectious diseases such as parvovirus.
Schedule Routine Veterinary Exams
Regular checkups can identify health problems before they become more serious.
What Dog Owners Should Track
When a dog is vomiting and having diarrhea, keeping a simple record can help your veterinarian identify patterns.
| What to Track | Details to Record |
| Vomiting | Number of episodes |
| Vomit | Color and contents |
| Diarrhea | Frequency and consistency |
| Blood | Yes or no |
| Appetite | Normal, reduced, or absent |
| Water | Normal, increased, or decreased |
| Energy | Normal or lethargic |
| Pain | None, mild, or severe |
| Diet | Recent changes |
| Possible exposure | Food, toxin, object |
| Medications | Current medications |
| Duration | Hours or days |
Take photographs of unusual vomit or stool when appropriate. They can sometimes help your veterinarian understand what you’re seeing.
Home Monitoring vs. Veterinary Evaluation
| Situation | Home Monitoring | Veterinary Evaluation |
| One mild vomiting episode | Sometimes | If it worsens |
| Mild diarrhea | Sometimes | If persistent |
| Repeated vomiting | ❌ | ✅ |
| Bloody diarrhea | ❌ | ✅ |
| Black/tarry stool | ❌ | ✅ |
| Severe lethargy | ❌ | ✅ |
| Suspected poisoning | ❌ | ✅ |
| Suspected obstruction | ❌ | ✅ |
| Puppy with vomiting + diarrhea | Caution | Often recommended |
| Cannot keep water down | ❌ | ✅ |
| Severe abdominal pain | ❌ | ✅ |
| Swollen abdomen + retching | ❌ | Emergency |
The safest approach is always to consider the whole clinical picture, not just one symptom.
Common Mistakes Dog Owners Make
Waiting Too Long
Some owners wait several days hoping vomiting and diarrhea will disappear.
While mild cases can improve, persistent or worsening symptoms should not be ignored.
Giving Human Medication
Human medications aren’t automatically safe for dogs.
Always ask a veterinarian before giving medication.
Offering Rich Foods
Fatty leftovers can worsen gastrointestinal upset and may be particularly dangerous for dogs susceptible to pancreatitis.
Ignoring Blood
Blood in vomit or stool should receive appropriate attention.
Assuming Drinking Means the Dog Is Fine
A dog can continue drinking while still losing more fluid than it can replace.
Ignoring Possible Foreign-Body Ingestion
A sock, toy, bone, plastic item, or piece of fabric can become lodged in the gastrointestinal tract.
If you know or strongly suspect your dog swallowed something unusual, contact your veterinarian.
Trying Internet Home Remedies
Online remedies can be misleading or dangerous.
This is especially true when the underlying problem could be poisoning, obstruction, pancreatitis, or severe infection.
Common Causes of Dog Vomiting and Diarrhea
When a dog develops vomiting and diarrhea together, the digestive tract is usually being irritated or affected in some way. The cause may be temporary, but it can also signal a condition that needs veterinary treatment.
Dietary Indiscretion
One of the most common causes is dietary indiscretion, which simply means eating something the dog should not have eaten.
Dogs may develop digestive upset after eating:
- Garbage or spoiled food
- Table scraps
- Fatty foods
- Too many treats
- Another pet’s food
- Bones or food scraps
- Unfamiliar foods
- Food found outdoors
Some dogs recover quickly after a dietary mistake, while others can develop more serious problems such as pancreatitis or an intestinal obstruction.
Sudden Food Changes
Changing dog food too quickly can disrupt the digestive system.
A new protein source, different brand, new treats, or sudden change from puppy to adult food may result in:
- Loose stool
- Diarrhea
- Vomiting
- Gas
- Reduced appetite
Whenever possible, introduce a new diet gradually over several days rather than changing foods overnight.
Food Intolerance or Food Allergy
Some dogs repeatedly develop gastrointestinal symptoms after eating particular ingredients.
Possible signs include:
- Chronic or recurring diarrhea
- Vomiting
- Gas
- Abdominal discomfort
- Itchy skin
- Recurrent ear or skin problems
A food intolerance is different from a true food allergy, so persistent symptoms should be evaluated by a veterinarian rather than diagnosed at home.
Stress and Anxiety
The digestive system can respond strongly to stress.
A dog may develop diarrhea or even vomiting after:
- Boarding
- Traveling
- Moving house
- Fireworks
- Introducing another pet
- Changes in household routine
- Visits to unfamiliar places
Stress may contribute to digestive upset, but it should not automatically be blamed when symptoms are severe or persistent.
Parasites That Can Cause Vomiting and Diarrhea
Intestinal parasites are another important possibility, particularly in puppies and dogs that spend significant time outdoors.
Common parasites include:
- Giardia
- Roundworms
- Hookworms
- Whipworms
- Coccidia
- Tapeworms
Symptoms vary depending on the parasite and the individual dog.
A veterinarian may recommend a fecal examination when diarrhea persists, returns repeatedly, or occurs alongside weight loss, poor appetite, or other symptoms.
Giardia
Giardia can cause soft or watery stool, mucus, abdominal discomfort, and intermittent diarrhea.
Because parasites aren’t always visible in a dog’s stool, the absence of visible worms does not rule out intestinal parasites.
Viral and Bacterial Infections
Several infections can cause acute vomiting and diarrhea.
Canine Parvovirus
Parvovirus is particularly concerning in young, unvaccinated, or incompletely vaccinated puppies.
Possible signs include:
- Severe vomiting
- Profuse diarrhea
- Blood in the stool
- Loss of appetite
- Extreme lethargy
- Dehydration
- Weakness
A puppy with significant vomiting and diarrhea should be assessed promptly, particularly when vaccination protection is incomplete.
Bacterial Gastrointestinal Infections
Certain bacteria can contribute to gastrointestinal illness, including:
- Salmonella
- Campylobacter
- Clostridium species
- Other gastrointestinal bacteria
Treatment depends on the underlying cause and the dog’s condition. Antibiotics are not automatically appropriate for every dog with diarrhea.
Pancreatitis
Pancreatitis, or inflammation of the pancreas, can cause both vomiting and diarrhea.
Other possible signs include:
- Abdominal pain
- Loss of appetite
- Lethargy
- Weakness
- Dehydration
- Reluctance to move
A very rich or fatty meal can contribute to pancreatitis in susceptible dogs, although pancreatitis has many possible causes.
Dogs with persistent vomiting, abdominal pain, or marked lethargy should be evaluated by a veterinarian.
Foreign Body or Intestinal Blockage
A dog that swallows something it cannot digest may develop a gastrointestinal obstruction.
Common examples include:
- Socks
- Toys
- Plastic
- Rocks
- Bones
- Fabric
- String
- Small household objects
Possible warning signs include:
- Repeated vomiting
- Loss of appetite
- Abdominal pain
- Lethargy
- Difficulty passing stool
- Repeated attempts to vomit
- Abdominal swelling
An obstruction can become life-threatening. Do not wait for the object to pass naturally if you suspect a blockage.
Veterinary imaging may be necessary, and some cases require endoscopy or surgery.
Poisoning and Toxic Exposure
Vomiting and diarrhea can also occur after exposure to toxic substances.
Potential hazards include:
- Chocolate
- Xylitol
- Grapes and raisins
- Human medications
- Rodenticides
- Insecticides
- Cleaning chemicals
- Toxic plants
- Cannabis products
- Alcohol
- Caffeine
If poisoning is suspected, contact a veterinarian immediately.
Do not attempt to treat a suspected poisoning with random home remedies. Some substances can cause substantially more injury if a dog vomits.
How Serious Are Vomiting and Diarrhea in Dogs?
The seriousness depends on several factors.
Consider:
- How often the dog is vomiting
- How severe the diarrhea is
- Whether blood is present
- Whether the dog can drink
- Whether water stays down
- The dog’s energy level
- Age and body size
- Existing health conditions
- Possible toxin exposure
- Possible foreign-body ingestion
Mild Digestive Upset
A dog may sometimes be monitored at home when there is:
- One isolated vomiting episode
- Mild diarrhea
- Normal energy
- Normal behavior
- Normal drinking
- No abdominal pain
- No blood
Even then, close observation is important.
Moderate Symptoms
Veterinary advice becomes more important when you notice:
- Several vomiting episodes
- Frequent diarrhea
- Reduced appetite
- Mild lethargy
- Increasing thirst
- Possible dehydration
Severe Symptoms
Treat the situation as urgent when there is:
- Blood in vomit
- Bloody diarrhea
- Black, tarry stool
- Repeated vomiting
- Severe abdominal pain
- Collapse
- Extreme weakness
- Pale or white gums
- Difficulty breathing
- Seizures
When Is Dog Vomiting and Diarrhea an Emergency?
Some combinations of symptoms should not be managed at home.
Seek urgent veterinary care if your dog has:
- Repeated vomiting
- Vomiting that won’t stop
- Bloody vomit
- Coffee-ground-like vomit
- Bloody diarrhea
- Black or tarry stool
- Severe lethargy
- Collapse
- Severe abdominal pain
- A swollen abdomen
- Repeated unproductive retching
- Difficulty breathing
- Seizures
- Suspected poisoning
- Suspected foreign-body ingestion
- Inability to keep water down
A particularly important warning sign is repeated retching without producing vomit, especially when accompanied by abdominal enlargement. This can occur with gastric dilatation-volvulus (GDV), a life-threatening emergency.
Dog Vomiting and Diarrhea With Blood
Blood changes the situation considerably.
What Does Blood in Vomit Mean?
Fresh red blood may indicate recent bleeding, while dark material resembling coffee grounds can represent partially digested blood.
Possible causes include:
- Gastrointestinal irritation
- Severe inflammation
- Foreign material
- Ulceration
- Toxin exposure
- Gastrointestinal bleeding
The appearance of blood alone cannot determine the cause.
What Does Blood in Diarrhea Mean?
Bright red blood often originates from the lower gastrointestinal tract, while black, tarry stool can indicate digested blood from higher in the digestive system.
Blood may appear with:
- Mucus
- Watery diarrhea
- Frequent bowel movements
- Straining
Bloody diarrhea accompanied by vomiting, weakness, pale gums, or collapse deserves immediate veterinary attention.
Dog Vomiting and Diarrhea With Other Symptoms
The symptoms occurring alongside vomiting and diarrhea can provide important clues.
Vomiting, Diarrhea, and Lethargy
Lethargy can occur with dehydration, infection, pain, toxin exposure, pancreatitis, and systemic illness.
A dog that becomes increasingly weak or difficult to rouse should be evaluated promptly.
Vomiting, Diarrhea, and Loss of Appetite
A temporary decrease in appetite can occur during stomach upset.
However, refusal to eat becomes more concerning when it occurs with:
- Repeated vomiting
- Significant diarrhea
- Abdominal pain
- Lethargy
- Dehydration
Vomiting, Diarrhea, and Abdominal Pain
This combination can occur with:
- Pancreatitis
- Gastroenteritis
- Foreign-body obstruction
- Severe intestinal inflammation
- GDV and other abdominal emergencies
A dog that repeatedly assumes a hunched posture, cries when touched, or cannot get comfortable may be experiencing significant pain.
Vomiting, Diarrhea, and Fever
Fever can occur with infection and inflammation.
A veterinarian can determine whether the dog’s temperature is abnormal and whether additional testing is necessary.
Vomiting, Diarrhea, and Shaking
Shaking can occur because of:
- Pain
- Nausea
- Fever
- Anxiety
- Toxin exposure
- Low blood sugar
A dog with vomiting, diarrhea, and significant shaking should not simply be assumed to have an upset stomach.
Signs of Dehydration in Dogs
Vomiting and diarrhea can cause rapid fluid and electrolyte loss.
This is especially important in small dogs and puppies.
Common Signs of Dehydration
Watch for:
- Dry or tacky gums
- Weakness
- Lethargy
- Reduced appetite
- Reduced skin elasticity
- Sunken-looking eyes in more severe cases
A home dehydration check is not always reliable, particularly in older dogs or dogs with certain health conditions.
If dehydration is suspected, contact your veterinarian.
Which Dogs Dehydrate Faster?
Extra caution is appropriate for:
- Puppies
- Small breeds
- Senior dogs
- Dogs with kidney disease
- Dogs with liver disease
- Dogs with diabetes
- Dogs with other chronic illnesses
- Dogs experiencing repeated vomiting
- Dogs with severe diarrhea
Dog Vomiting and Diarrhea in Puppies
Puppies deserve special attention because they have fewer physiological reserves than healthy adult dogs.
Potential causes include:
- Dietary changes
- Parasites
- Gastrointestinal infections
- Parvovirus
- Foreign bodies
- Toxins
- Low blood sugar
Parvovirus Risk
An incompletely vaccinated puppy with vomiting and diarrhea should be taken seriously.
Parvovirus can cause severe gastrointestinal disease and dehydration.
If a puppy has vomiting plus diarrhea, lethargy, poor appetite, or bloody stool, contact a veterinarian promptly.
Low Blood Sugar
Very young or tiny puppies can be more vulnerable to low blood glucose, especially when they aren’t eating and are losing fluids.
Weakness, unusual sleepiness, tremors, or collapse require urgent veterinary attention.
Dog Vomiting and Diarrhea in Senior Dogs
Older dogs may have underlying conditions that complicate an episode of gastrointestinal illness.
Potential contributors include:
- Kidney disease
- Liver disease
- Pancreatitis
- Medication effects
- Chronic gastrointestinal disorders
- Cancer
- Metabolic disease
Senior dogs may also tolerate dehydration less effectively than otherwise healthy adults.
For this reason, persistent vomiting or diarrhea in an older dog deserves a relatively low threshold for veterinary evaluation.
What to Do at Home for Mild Dog Vomiting and Diarrhea
Home monitoring should only be considered when the symptoms are mild, the dog is otherwise bright and comfortable, and there are no emergency warning signs.
Monitor Your Dog Closely
Keep track of:
| What to Monitor | What to Record |
|---|---|
| Vomiting | Number of episodes |
| Vomit | Color and contents |
| Diarrhea | Frequency and appearance |
| Blood | Present or absent |
| Appetite | Normal, reduced, or absent |
| Water | Drinking normally or not |
| Energy | Normal or lethargic |
| Pain | None or suspected |
| Diet | Recent changes |
| Possible exposure | Food, toxin, object |
| Medications | Current medications |
| Duration | Hours or days |
This information can be extremely helpful if you need to contact your veterinarian.
Can I Give My Dog Water After Vomiting?
Hydration matters, but giving a vomiting dog a huge amount of water at once may trigger additional vomiting.
Allow access to fresh water and avoid encouraging the dog to rapidly consume a large volume.
If your dog repeatedly vomits after drinking or cannot keep fluids down, contact a veterinarian promptly.
Do not force water into a dog that is weak, unconscious, having seizures, or unable to swallow normally.
What Can I Feed a Dog With Vomiting and Diarrhea?
The appropriate diet depends on the dog’s condition.
For a mild episode, a veterinarian may recommend an easily digestible gastrointestinal diet once vomiting has stopped.
Small portions may be easier to tolerate than one large meal.
Avoid:
- Fatty foods
- Table scraps
- Spicy foods
- Bones
- Excessive treats
- Rich leftovers
- Foods your dog has previously reacted to
Veterinary gastrointestinal diets are often preferable to relying on homemade diets for extended periods because they are formulated to provide appropriate nutrition.
Should You Withhold Food From a Vomiting Dog?
Older advice sometimes recommended prolonged fasting for gastrointestinal upset.
Modern veterinary care is more individualized.
A veterinarian may recommend a temporary adjustment to food intake in some cases, but prolonged fasting is not appropriate for every dog.
Extra caution is needed with:
- Puppies
- Toy breeds
- Diabetic dogs
- Underweight dogs
- Senior dogs
- Dogs with chronic medical conditions
If your dog is repeatedly vomiting, ask your veterinarian about feeding rather than relying on a generic fasting rule.
Can Dogs Take Human Medicine for Vomiting or Diarrhea?
Do not give human medication to your dog unless a veterinarian specifically tells you to do so.
This includes medications such as:
- Pepto-Bismol
- Loperamide/Imodium
- Pain relievers
- Anti-nausea medications
- Other over-the-counter gastrointestinal products
Some medications can be dangerous, interact with existing prescriptions, or mask symptoms of a more serious condition.
The safest treatment depends on why the dog is vomiting or having diarrhea.
Probiotics for Dogs With Diarrhea
Canine probiotics may support healthy intestinal bacteria in some situations.
They may be considered by veterinarians for certain cases of digestive upset, particularly when gut flora have been disrupted.
However, probiotics are not a cure for every cause of diarrhea.
They cannot replace treatment for:
- Foreign-body obstruction
- Severe dehydration
- Poisoning
- Parvovirus
- Significant pancreatitis
- Serious systemic disease
Choose a product formulated specifically for dogs and follow veterinary guidance when symptoms are significant or persistent.
When to Call the Veterinarian
Call Immediately If:
- Blood appears in vomit
- Blood or black stool appears
- Your dog collapses
- Your dog has seizures
- Severe abdominal pain is present
- Your dog has difficulty breathing
- Poisoning is suspected
- A foreign object may have been swallowed
- The abdomen is swollen
- Your dog repeatedly retches without producing vomit
Call Promptly If:
- Vomiting continues
- Diarrhea is severe
- Your dog refuses food and water
- Your dog cannot keep water down
- Your dog becomes unusually tired
- Dehydration is suspected
- Symptoms are getting worse rather than better
Persistent diarrhea also deserves veterinary attention. Cornell University College of Veterinary Medicine advises contacting a veterinarian when diarrhea lasts around 48–72 hours, or sooner when it occurs with vomiting, lethargy, appetite loss, or black/tarry stool.
How Veterinarians Diagnose Dog Vomiting and Diarrhea
Veterinary diagnosis begins with the dog’s history and physical examination.
Medical History
Expect questions such as:
- What did your dog eat?
- When did the symptoms begin?
- How many times has your dog vomited?
- What did the vomit look like?
- How often has your dog had diarrhea?
- Is there blood?
- Has the diet changed?
- Could your dog have swallowed an object?
- Could there have been toxin exposure?
- Is your dog vaccinated?
- What medications does your dog take?
Providing accurate information can help the veterinarian determine which tests are most useful.
Physical Examination
The veterinarian may evaluate:
- Hydration
- Gum color and moisture
- Heart rate
- Respiratory rate
- Body temperature
- Abdominal tenderness
- Intestinal sounds
- Body condition
- Overall alertness
Fecal Testing
A stool sample may help identify certain gastrointestinal parasites and infections.
Testing can be particularly useful when diarrhea is:
- Persistent
- Recurrent
- Severe
- Associated with weight loss
- Occurring in a puppy
Your veterinarian may recommend specific tests based on the dog’s age, history, environment, and symptoms.
Blood Tests
Blood work can provide information about the dog’s overall health.
Depending on the situation, testing may evaluate:
- Kidney function
- Liver function
- Electrolytes
- Blood glucose
- Hydration-related changes
- Inflammation
- Red and white blood cells
- Pancreatic markers
Blood tests are particularly valuable when vomiting and diarrhea are accompanied by lethargy, weakness, dehydration, or other systemic symptoms.
X-Rays and Ultrasound
Imaging may be recommended when the veterinarian suspects a foreign body, obstruction, pancreatitis, or another abdominal problem.
X-Rays
Radiographs may help identify:
- Certain swallowed objects
- Abnormal gas patterns
- Intestinal obstruction
- Abdominal abnormalities
Not every foreign object is clearly visible on an X-ray, so additional imaging may sometimes be necessary.
Ultrasound
Ultrasound can provide detailed information about:
- Intestinal walls
- Pancreas
- Liver
- Lymph nodes
- Abdominal organs
- Some foreign bodies
- Other structural abnormalities
How Veterinarians Treat Dog Vomiting and Diarrhea
Treatment depends on the underlying cause and severity.
There is no single medication that is appropriate for every dog.
Fluid Therapy
Depending on dehydration and illness severity, fluid therapy may include:
- Oral fluids in appropriate cases
- Subcutaneous fluids
- Intravenous fluids
Dogs with significant dehydration or ongoing losses may require IV fluids and hospitalization.
Anti-Vomiting Medication
Veterinarians may prescribe anti-nausea or anti-vomiting medication when appropriate.
These medications can help a dog retain fluids and food, but they should not be used to hide symptoms of a suspected obstruction or other emergency without proper evaluation.
Gastrointestinal Diets
A veterinarian may recommend a specially formulated gastrointestinal diet that is:
- Easily digestible
- Nutritionally complete
- Appropriate for the dog’s condition
Treatment for Parasites
If testing identifies parasites, the veterinarian can prescribe the appropriate medication.
The treatment depends on the organism involved.
Simply giving a general dewormer without determining the likely cause may not solve the problem because different parasites require different treatments.
Are Antibiotics Necessary?
Not every case of vomiting and diarrhea requires antibiotics.
Many episodes are caused by problems where antibiotics provide little or no benefit.
Unnecessary antibiotic use can also contribute to antimicrobial resistance and disrupt the intestinal microbiome.
A veterinarian should determine whether antibiotics are appropriate based on the dog’s condition and suspected cause.
Treatment for Pancreatitis
Treatment for pancreatitis depends on severity.
It may include:
- IV fluids
- Pain management
- Anti-nausea medication
- Nutritional support
- Monitoring of blood work
- Hospitalization in serious cases
Dogs with suspected pancreatitis should not be treated simply by giving random medications or supplements at home.
Treatment for a Foreign-Body Obstruction
A suspected obstruction requires veterinary evaluation.
Depending on the location and nature of the object, treatment may include:
- Careful monitoring in selected cases
- Endoscopy
- Surgery
- Hospitalization
- IV fluids
- Pain control
If you know your dog swallowed a toy, sock, bone, string, or another object, don’t wait for severe symptoms before contacting your veterinarian.
How Long Does Dog Vomiting and Diarrhea Last?
There is no universal duration.
A mild episode of gastrointestinal upset may improve relatively quickly, while infectious disease, parasites, pancreatitis, obstruction, and chronic gastrointestinal disorders can last much longer.
Mild Acute Gastrointestinal Upset
Some mild cases improve within a day or two.
Infectious Causes
Duration varies depending on the organism and severity.
Parasites
Symptoms may continue until the underlying parasite is treated.
Pancreatitis
Mild cases may improve relatively quickly, while severe pancreatitis can require prolonged treatment and hospitalization.
Chronic Gastrointestinal Disease
Repeated vomiting or diarrhea should not simply be managed repeatedly at home.
If symptoms keep returning, the underlying cause needs to be investigated.
Chronic Vomiting and Diarrhea in Dogs
Repeated digestive problems may indicate an underlying disease.
Potential causes include:
- Food intolerance
- Inflammatory bowel disease
- Parasites
- Pancreatic disorders
- Liver disease
- Kidney disease
- Cancer
- Chronic infections
- Dietary problems
Watch for additional signs such as:
- Weight loss
- Poor coat quality
- Appetite changes
- Increased thirst
- Increased urination
- Reduced energy
- Recurring abdominal discomfort
A dog with chronic gastrointestinal symptoms may need blood testing, fecal testing, dietary investigation, imaging, or other diagnostic procedures.
Dog Diarrhea Colors and What They May Mean
Stool color can provide clues, but color alone cannot diagnose a disease.
Brown Diarrhea
Brown is generally the expected stool color, although loose stool can occur for many reasons.
Yellow Diarrhea
Yellow stool may occur with rapid intestinal transit, dietary changes, or other gastrointestinal problems.
Green Diarrhea
Green stool can sometimes occur after eating grass or certain foods, but persistent green diarrhea should be evaluated in context.
Red or Bloody Diarrhea
Fresh red blood can indicate bleeding in the lower digestive tract.
Significant or repeated bloody diarrhea requires veterinary attention.
Black or Tarry Diarrhea
Black, tarry stool may represent digested blood and should be treated as a potentially serious warning sign.
What Does Dog Vomit Color Mean?
Vomit color can sometimes provide useful information, but it should never be interpreted in isolation.
Clear Vomit
May consist primarily of fluid or saliva.
White Foam
Foamy vomit can occur with stomach irritation or nausea, among other causes.
Yellow Vomit
Yellow material often contains bile.
Green Vomit
Green material may contain bile or ingested plant material.
Brown Vomit
Brown vomit can have several possible explanations, including food contents or gastrointestinal material.
Red or Bloody Vomit
Fresh blood should receive prompt veterinary attention.
Coffee-Ground-Like Vomit
Dark granular material resembling coffee grounds can indicate partially digested blood and warrants urgent veterinary assessment.
Dog Vomiting and Diarrhea After Changing Food
A sudden dietary transition is a common cause of digestive upset.
When changing foods, gradually introduce the new food instead of replacing the old diet all at once.
A transition can be especially important when:
- Changing protein sources
- Switching brands
- Moving from puppy to adult food
- Introducing a prescription diet
- Adding new treats
If vomiting and diarrhea continue despite returning to a familiar diet, don’t assume the food transition is the only explanation.
Dog Vomiting and Diarrhea After Eating Grass
Many dogs occasionally eat grass.
Grass consumption does not necessarily mean a dog is sick, and dogs may eat grass for several reasons.
However, if your dog repeatedly eats grass and then develops:
- Frequent vomiting
- Persistent diarrhea
- Loss of appetite
- Lethargy
- Abdominal pain
a veterinary assessment may be appropriate.
Dog Vomiting and Diarrhea After Eating Human Food
Human foods can cause digestive upset even when they aren’t poisonous.
Potential problems include:
- Fatty foods
- Dairy products
- Spicy foods
- Large portions
- Chocolate
- Grapes and raisins
- Onions and garlic
- Xylitol
- Alcohol
- Caffeine
Some of these foods are not merely irritating—they can be toxic to dogs.
If your dog consumes a potentially toxic food, contact a veterinarian rather than waiting for symptoms to appear.
Dog Vomiting and Diarrhea From Stress
Stress can affect gastrointestinal function.
Possible triggers include:
- Moving
- Traveling
- Boarding
- Fireworks
- New people
- New pets
- Changes in routine
- Separation-related stress
Reducing unnecessary stress may help some dogs.
Useful strategies include:
- Keeping a predictable routine
- Providing a quiet resting area
- Introducing changes gradually
- Using positive reinforcement
- Maintaining appropriate exercise
- Avoiding unnecessary disruptions
Still, persistent vomiting and diarrhea should not automatically be attributed to stress.
How to Prevent Vomiting and Diarrhea in Dogs
Prevention begins with reducing exposure to common triggers.
Feed a Consistent Diet
Avoid frequent, unnecessary food changes.
Introduce New Foods Gradually
Give your dog’s digestive system time to adjust.
Limit Table Scraps
Human food can cause digestive upset and may contain toxic ingredients.
Prevent Garbage Eating
Use secure trash containers and keep food waste out of reach.
Keep Toxic Foods Away
Store chocolate, xylitol-containing products, medications, and other hazards securely.
Maintain Parasite Prevention
Follow your veterinarian’s recommendations for parasite control.
Keep Vaccinations Current
Vaccination is especially important for reducing the risk of serious infectious diseases such as canine parvovirus.
Schedule Routine Veterinary Exams
Regular checkups can help identify health problems before they become advanced.
What Dog Owners Should Track
A simple symptom log can make a surprisingly big difference during a veterinary consultation.
| What to Track | Details |
| Vomiting | Number and frequency |
| Vomit | Color, food, blood, foreign material |
| Diarrhea | Frequency and consistency |
| Blood | Fresh red or black/tarry |
| Appetite | Normal, reduced, absent |
| Water | Normal, increased, reduced |
| Energy | Normal, tired, weak |
| Pain | None, suspected, severe |
| Diet | Recent changes |
| Exposure | Food, toxin, object |
| Medication | Current medications |
| Duration | Hours or days |
Taking a photo of unusual vomit or stool can also be useful for your veterinarian, especially when the appearance changes between episodes.
Home Monitoring vs. Veterinary Evaluation
| Situation | Home Monitoring | Veterinary Evaluation |
| One mild vomiting episode | Sometimes | If it continues |
| Mild diarrhea | Sometimes | If persistent |
| Repeated vomiting | ❌ | ✅ |
| Bloody diarrhea | ❌ | ✅ |
| Black/tarry stool | ❌ | ✅ |
| Severe lethargy | ❌ | ✅ |
| Suspected poisoning | ❌ | ✅ |
| Suspected obstruction | ❌ | ✅ |
| Puppy with vomiting + diarrhea | Caution | Often recommended |
| Can’t keep water down | ❌ | ✅ |
| Severe abdominal pain | ❌ | ✅ |
| Swollen abdomen + retching | ❌ | Emergency |
The key is to evaluate the entire clinical picture, not just the number of episodes.
Common Mistakes Dog Owners Make
Waiting Too Long
A dog can deteriorate surprisingly quickly when vomiting and diarrhea are severe.
Giving Human Medication
A medication that is safe for people may not be safe or appropriate for dogs.
Offering Rich Foods
Fatty foods can worsen digestive upset and may contribute to pancreatitis in susceptible dogs.
Ignoring Blood
Blood in vomit or stool should never be casually dismissed.
Assuming Drinking Means the Dog Is Hydrated
A dog can continue drinking while still losing more fluid through vomiting and diarrhea than it can replace.
Ignoring Possible Foreign-Body Ingestion
If your dog may have swallowed a sock, toy, bone, string, or another object, contact a veterinarian.
Trying Internet Home Remedies
Home remedies can sometimes make a gastrointestinal problem worse or delay appropriate treatment.
Conclusion
Dog vomiting and diarrhea can range from a temporary digestive upset to a sign of a serious medical emergency. Eating something unusual, changing food too quickly, stress, and mild gastrointestinal irritation are common causes, but conditions such as parvovirus, pancreatitis, intestinal obstruction, poisoning, parasites, kidney disease, and liver disease can produce similar symptoms.
The most important thing is to look at the whole picture. A dog that vomits once and has mild diarrhea but remains bright, comfortable, hydrated, and interested in normal activities may sometimes be monitored closely. However, repeated vomiting, severe diarrhea, blood in the vomit or stool, black or tarry stool, abdominal pain, significant lethargy, collapse, or an inability to keep water down should never be ignored.
Puppies, senior dogs, small breeds, and dogs with existing medical conditions deserve extra caution because dehydration and complications can develop more quickly.
If poisoning or a foreign-body ingestion is possible, don’t wait for symptoms to become severe. Contact your veterinarian or an appropriate animal poison-control service immediately, and avoid giving home remedies or human medications unless a veterinary professional specifically instructs you to do so.
For mild digestive upset, your veterinarian may recommend careful hydration, an easily digestible diet, and close observation. But home care should never replace professional treatment when symptoms are persistent, severe, or worsening.
Preventive care also plays an important role. Feed a consistent, balanced diet, introduce new foods gradually, keep toxic substances and garbage out of reach, maintain parasite prevention and vaccinations, and schedule regular veterinary examinations.
Ultimately, the safest approach is simple: pay attention to changes in your dog’s behavior and digestive health, know the emergency warning signs, and seek veterinary advice when you’re unsure. Acting early can make treatment easier and may prevent a relatively manageable problem from becoming a much more serious one.