Key takeaways
- Call your veterinarian when vomiting and diarrhoea occur together, particularly if either is repeated.
- Emergency signs include blood or black stool, a painful or swollen abdomen, repeated dry heaving, collapse, pale gums, marked weakness, suspected poisoning or inability to keep water down.
- Do not give human anti-diarrhoeal, pain or nausea medicines unless a veterinarian specifically directs you.
- A veterinary gastrointestinal diet is preferable when available. A home-cooked chicken and rice meal is a short-term bridge only, not a complete diet.
- Offer small, frequent meals only after vomiting has stopped and your veterinarian agrees that home feeding is appropriate.
When Basil is not himself, the first question is not “Which ingredient will fix this?” It is “Could this be urgent?” Vomiting and diarrhoea are symptoms, not a diagnosis. A stolen fatty snack may be the cause, but parasites, infection, pancreatitis, a foreign object, toxin exposure and other illnesses can look similar at home.
🚨 Get urgent veterinary help now if you notice
- repeated vomiting, repeated diarrhoea or an inability to keep water down
- fresh blood, coffee-ground material in vomit, or black and tarry stool
- a swollen or painful abdomen, restlessness, or repeated attempts to vomit with little coming up
- collapse, severe weakness, pale or white gums, breathing difficulty or reduced responsiveness
- possible access to medication, xylitol, chocolate, grapes, raisins, compost, chemicals, a toy, bone or other foreign material
- a puppy, very small dog, senior dog, pregnant dog, or a dog with diabetes, kidney disease or another medical condition
If you are unsure, phone your veterinarian or nearest emergency hospital and describe the number of vomiting and diarrhoea episodes, your dog's energy, gum colour, water intake and anything they may have eaten.
Why the combination matters
Diarrhoea moves water through the gut too quickly for normal absorption. Vomiting removes more fluid before it can be used. Cornell University notes that the combination accelerates dehydration, which can disturb electrolytes and place extra strain on the kidneys.
This is why advice written for a bright adult dog with one mild loose stool does not automatically apply to a dog who is also vomiting. VCA advises that a pet who is lethargic, too nauseated to drink, vomiting or passing blood should not be managed as a simple at-home stomach upset.
What to do while you contact the vet
- Remove access to suspicious food or objects. Save packaging, ingredient lists or a photograph if poisoning is possible.
- Write down the timeline. Record each episode, appearance, appetite, water intake, medications and recent foods. Take clear photos and collect a fresh stool sample in a sealed container if practical.
- Keep fresh water available unless your vet says otherwise. Do not force water or syringe it into a nauseated dog. A dog who repeatedly vomits after drinking needs veterinary care.
- Keep your dog quiet and comfortable. Avoid exercise, rich treats and scavenging while you arrange advice.
- Follow the feeding plan your vet gives you. Current veterinary nutrition guidance does not support routine long fasts for every gastrointestinal upset. Some vomiting cases may need a short pause, but that decision depends on the dog and cause.
🔬 Fasting advice has changed
Older advice often recommended withholding food for 24 to 48 hours. VCA's veterinary nutrition guidance explains that the recovering gut needs nutrients and that prolonged fasting may delay recovery. A veterinarian may still recommend a short fast for profuse vomiting or a procedure, so follow individual advice rather than a universal rule.
When food can restart
If your veterinarian says home feeding is reasonable, wait until vomiting is controlled and your dog can keep water down. Start with a very small amount of a highly digestible, low-fat veterinary gastrointestinal diet. Small meals given more often are generally easier to tolerate than one normal-sized bowl.
A plain home-cooked meal such as skinless chicken breast and very soft white rice may be used briefly when your vet agrees and a therapeutic diet is unavailable. VCA notes that traditional chicken and rice is deficient in more than ten essential nutrients, so it should not become the ongoing diet.
🍚 Think teaspoon, not dinner bowl
The first meal is a tolerance test. Offer a small amount, wait and watch. If vomiting returns, stop feeding and call the vet. If the meal stays down, your vet may advise gradually increasing the amount across several small meals.
What not to give
⚠️ Skip the medicine cabinet and rich “remedies”
- No ibuprofen, aspirin, paracetamol or other human painkillers.
- No Pepto-Bismol or loperamide unless your veterinarian directs it for this dog.
- No butter, oil, fatty meat, skin, cheese, milk, bone broth made with onion or garlic, sardines or fish oil during active stomach upset.
- No eggshell calcium, vitamin powder or multiple supplements in a short-term bland meal unless your veterinarian prescribes them.
The goal is not to make a temporary recovery meal complete. The goal is to avoid adding digestive load while the cause is assessed and the dog returns to normal feeding.
How to return to normal food
Once stools are improving, vomiting has stopped and your dog is acting normally, follow your veterinarian's transition plan. A gradual blend over several days is gentler than suddenly replacing the recovery food with a full normal portion. If signs return during the transition, contact the clinic.
Do not keep repeating a bland diet whenever symptoms recur. Recurrent vomiting or diarrhoea needs investigation for parasites, food intolerance, chronic intestinal disease, pancreatic problems, endocrine disease or other causes.
Sources
- Cornell University College of Veterinary Medicine. Diarrhea: worry or wait?
- Grant C, Buzhardt L. VCA Animal Hospitals. Nutrition for dogs and cats with gastrointestinal upset.
- VCA Animal Hospitals. What to do if your pet has an upset stomach.
- Merck Veterinary Manual. Vomiting in dogs.
- VCA Animal Hospitals. Gastroenteritis in dogs.
Veterinary note: This article provides general information and cannot diagnose your dog. Vomiting with diarrhoea can require prompt examination, fluids, anti-nausea treatment or testing. Contact your veterinarian for advice based on your dog's age, history and current signs.