My dog is vomiting: causes, home care & when to call the vet
A plain-English guide to vomiting in dogs — what\'s usually fine, what isn\'t, and what to do today.
A single vomit in an otherwise bright, playful dog is usually nothing to worry about — dogs regurgitate for the same prosaic reasons humans do: eating too quickly, swallowing grass, drinking water after exercise. But vomiting that repeats, contains blood, or comes with lethargy, a swollen belly, or pain shifts the picture immediately.
The first 12 hours after vomiting starts are the most informative. Note exactly what came up (food, foam, yellow bile, blood, foreign material), how often, and what your dog was doing in the 24 hours before. That timeline is the single most useful thing you can hand a vet, and it's what we built the Pet Capsule health log around.
If your dog is a puppy, a senior, has a known chronic illness, or is a flat-faced breed (Bulldogs, Pugs, French Bulldogs), the threshold for calling a vet is lower — these dogs decompensate faster and tolerate fluid loss poorly.
Common causes
Dietary indiscretion
Monitor at homeAte something they shouldn't — table scraps, garbage, a found item on a walk. Usually resolves in 24 hours with bland food.
Sudden food change
Monitor at homeSwitching brands or proteins without a 7-day gradual transition. Vomiting often pairs with soft stools.
Gastroenteritis
See a vet within 24–48 hoursInflammation of the stomach and intestines from a viral, bacterial, or dietary cause. May need supportive care from a vet.
Read more about gastroenteritis →Pancreatitis
See a vet within 24–48 hoursInflammation of the pancreas, often triggered by a high-fat meal. Causes vomiting, abdominal pain, and lethargy. Needs vet care.
Read more about pancreatitis →Foreign body obstruction
Emergency — vet nowA swallowed object stuck in the stomach or intestine. Vomiting is persistent, dog cannot keep water down. Surgical emergency.
Toxin ingestion
Emergency — vet nowChocolate, xylitol, grapes, lilies, antifreeze, rodenticides, human medications. Some toxins cause delayed symptoms.
Gastric dilatation-volvulus (bloat)
Emergency — vet nowStomach fills with gas and twists. Deep-chested breeds are at highest risk. Death within hours without surgery.
Read more about gastric dilatation-volvulus (bloat) →Kidney or liver disease
See a vet within 24–48 hoursChronic conditions, more common in older dogs. Vomiting often pairs with increased thirst and weight loss.
Read more about kidney or liver disease →What you can safely do at home
- Withhold food for 8–12 hours (adults only — never starve a puppy). This lets the stomach settle.
- Offer small amounts of water frequently — a tablespoon every 30 minutes — rather than a full bowl that may come straight back up.
- Reintroduce food slowly: boiled chicken breast (no skin, no salt) with white rice, half the normal portion, twice the normal frequency.
- Return to regular food over 3 days by mixing increasing amounts of normal food into the bland diet.
- Keep a vomit log: time, what came up, any blood, your dog's energy and appetite between episodes.
- Restrict to easy access to a quiet area; no rough play or long walks until 24 hours symptom-free.
These steps are general guidance for an otherwise well, healthy adult pet. If your dog is a puppy/kitten, a senior, or has a known chronic condition, call a vet rather than waiting it out.
What to expect at the vet
The vet will usually:
- Physical exam, including gum colour, hydration check, and abdominal palpation
- Questions about timeline, diet, possible toxin or foreign-body exposure, vaccination status
- Blood work (CBC and biochemistry) to check organ function and inflammation
- Abdominal X-rays or ultrasound if obstruction or bloat is suspected
- IV fluids if dehydrated, anti-nausea medication (maropitant/Cerenia), and sometimes a stomach protectant
Useful questions to ask:
- Could this be a foreign-body obstruction, and do we need imaging?
- Should we test for parvovirus or pancreatitis?
- What signs would mean I need to bring them back urgently?
- When can they go back to their normal diet?
- Is there an underlying condition we should investigate after this episode?
How to reduce the chance of it happening again
- Transition between foods over 7 days, not overnight.
- Keep human food, especially fatty scraps and known toxins, completely out of reach.
- Avoid feeding immediately before or after vigorous exercise — particularly for deep-chested breeds at bloat risk.
- Pick up sticks, socks, and small toys that could be swallowed; supervise chew toys.
- Keep current on vaccinations, particularly parvovirus for puppies and unvaccinated adults.
- Annual senior wellness blood work catches kidney and liver disease before vomiting begins.
Frequently asked questions
How long is too long to wait if my dog vomits once?
A single vomit in a bright, active adult dog who is drinking water can usually be watched for 12 hours. If a second vomit happens, the dog becomes lethargic, or any of the emergency signs appear, call a vet immediately.
What's the difference between vomiting and regurgitation?
Vomiting is active — the dog heaves, the abdomen contracts, and partially digested food comes up. Regurgitation is passive — undigested food or water comes back up without warning, often shortly after eating. Regurgitation suggests an oesophageal problem and warrants a separate vet conversation.
Is yellow foam dangerous?
Yellow foam is bile, usually meaning an empty stomach. One episode in the early morning ("bilious vomiting syndrome") often resolves with a small late-night snack. Repeated bile vomiting needs a vet.
Can I give my dog human anti-nausea medication?
No. Many human medications, including ibuprofen, paracetamol, and some Pepto-Bismol formulations, are toxic to dogs. Only use medications prescribed for your specific dog by a vet.
My puppy is vomiting — is it more serious?
Yes. Puppies dehydrate within hours and have weaker immunity. Any vomiting in a puppy under 6 months, especially if paired with diarrhoea or lethargy, warrants a same-day vet call to rule out parvovirus.