Vomiting and diarrhoea are among the most common reasons dogs visit the vet. Many cases are mild and settle with simple care at home. Others are the first sign of pancreatitis, a blockage, toxin exposure or another illness that needs prompt treatment.
The important question is not simply, “How many times has my dog vomited?” It is, “How is my dog behaving overall?”
A bright, comfortable adult dog who has vomited once or passed one or two loose stools—and can still keep water down—can usually be monitored closely at home. A dog who is weak, painful, repeatedly vomiting or unable to drink should not be treated as an ordinary tummy upset.
What should I do first?
If your dog has diarrhoea but is not vomiting
There is usually no need to withhold food. Offer a small meal of something easy to digest and relatively low in fat.
A veterinary gastrointestinal diet is ideal if you already have one. Plain, skinless boiled chicken with white rice can also be used for a day or two in an otherwise healthy dog, provided chicken suits them.
Feed small portions several times through the day rather than one full meal.
If your dog has vomited
Allow the stomach to settle for a few hours after the last episode.
Once your dog can keep water down, offer a very small amount of easily digestible food. If that stays down, continue with small, frequent meals.
If vomiting returns after food or water, stop the home trial and call your vet.
Keep water available
Do not deliberately withhold water from a dog with vomiting or diarrhoea. If gulping a full bowl triggers vomiting, offer smaller amounts more frequently.
Do not force water into your dog’s mouth or syringe-feed a nauseous dog. If even small drinks come straight back up, veterinary attention is needed.
Once your dog has recovered
Once your dog has recovered, gradually mix their normal food back in over two or three days rather than changing meals abruptly.
When is it reasonable to monitor at home?
A short period of home care is usually reasonable when:
- There has been only one vomiting episode, or a small number of loose stools
- Your dog remains bright, responsive and comfortable
- They are drinking and keeping water down
- There is no blood
- The abdomen does not appear swollen or painful
- Your dog is an otherwise healthy adult
- There is no possibility of toxin or foreign-object ingestion
Monitor closely over the next twelve to twenty-four hours. “Monitoring” means paying attention to your dog’s energy, comfort, drinking, urination and the frequency of any further vomiting or diarrhoea—not simply waiting to see what tomorrow brings.
When should I call the vet today?
Arrange a same-day assessment or veterinary advice if:
- Vomiting continues or keeps returning
- Your dog cannot keep water down
- Diarrhoea is very watery, frequent or worsening
- There is blood in the vomit
- There is more than a small streak of fresh blood in the stool
- The stool is black and tarry
- Your dog is quiet, weak, refusing food or appears uncomfortable
- The abdomen feels tense or painful
- Symptoms are not clearly improving within twenty-four hours
- Diarrhoea continues for more than forty-eight hours
Call earlier for puppies, particularly those not fully vaccinated, and for older dogs or dogs with diabetes, kidney disease or another ongoing health condition. These dogs may become dehydrated or develop complications more quickly.
When is it an emergency?
Seek immediate veterinary care if your dog has:
- Repeated retching without bringing anything up
- A rapidly enlarging or swollen abdomen
- Collapse, severe weakness or pale gums
- Severe or worsening abdominal pain
- Suspected toxin exposure
- Swallowed a toy, bone, fabric, corn cob or another possible foreign object
- Vomiting or diarrhoea accompanied by breathing difficulty, disorientation or seizures
Repeated unproductive retching, restlessness and a swollen abdomen can be signs of gastric dilatation-volvulus, commonly called bloat. This is a genuine emergency and should never be watched at home.
Can I check for dehydration at home?
The skin-tent test can provide a clue, but it is not reliable enough to be used on its own.
Older or very thin dogs may have reduced skin elasticity even when normally hydrated. Young dogs may have unusually elastic skin. Gum moisture can also be affected by panting, drooling and nausea.
Instead, look at the whole dog. Concerning signs include:
- Dry or tacky gums
- Sunken-looking eyes
- Weakness or unusual sleepiness
- Reduced urination
- Refusing water
- Drinking but repeatedly vomiting it back up
If fluid losses are continuing and you are unsure about hydration, it is safer to have your dog examined.
Track what matters. A simple weekly check-in on your dog's energy, appetite, comfort, stools, sleep, and thirst makes changes far easier to spot.
Two dogs, two different decisions
One dog gets into the bin, vomits once the next morning and remains bright and demanding breakfast. They keep down a small meal and have no further symptoms. Monitoring at home is reasonable.
Another dog vomits repeatedly, refuses water and lies in a hunched position with a tense abdomen. That dog needs veterinary assessment. The cause could be pancreatitis, an obstruction or another painful gastrointestinal condition—not simply something they ate.
What should I avoid giving?
Do not give human anti-nausea, anti-diarrhoeal or pain medication unless your vet has specifically prescribed it for your dog.
Some human medicines are toxic to dogs. Others can worsen gastrointestinal irritation, interact with existing medication or mask signs that would help your vet recognise a more serious problem.
Avoid fatty foods, rich treats, bones and large meals while the gut is recovering.
Why doesn’t every dog receive antibiotics?
The 2024 ENOVAT guidelines recommend against routine antibiotics for dogs with mild or moderate acute diarrhoea because controlled studies have not shown a clinically meaningful benefit.
Antibiotics can also disrupt the intestinal microbiome and contribute to antibiotic resistance. They remain important for selected dogs with severe systemic illness, suspected sepsis or a specific infection, but they should not be given “just in case”.
Frequently asked questions
My dog vomited once but now seems completely normal. Should I worry?
Usually not. A single episode is common and often resolves without treatment. Monitor closely for further vomiting, reduced appetite, discomfort or changes in behaviour.
Can I give my dog a probiotic?
You can discuss this with your vet, but it is optional rather than essential.
The 2024 ENOVAT review found that probiotics did not produce a clinically important reduction in the overall duration of acute diarrhoea. Different products contain different organisms and doses, so their effects are not interchangeable.
A probiotic should never replace veterinary care when your dog is unwell.
Is chicken and rice always the best bland diet?
No. It can be a useful short-term option, but it is not nutritionally complete and does not suit every dog.
Dogs with chicken sensitivity, pancreatitis, kidney disease or another condition may need a different diet. A complete veterinary gastrointestinal diet is often a more consistent choice.
How long should I wait before calling the vet?
For an otherwise healthy adult dog, call if symptoms are not clearly improving within twenty-four hours or if diarrhoea continues beyond forty-eight hours.
Do not wait for these time limits if your dog is becoming unwell or showing any of the warning signs above.
What if these tummy upsets keep happening?
Repeated episodes over several weeks or months should be investigated rather than managed as separate accidents.
Possible causes include parasites, food-responsive disease, pancreatic problems, Addison’s disease or chronic inflammatory enteropathy. Keeping a record of your dog’s food, treats, symptoms and stool changes can help your vet identify a pattern.
The most important thing to watch
Most mild tummy upsets settle with small meals, adequate water and a little time. The clearest warning sign is often not the vomit or stool itself, but a change in the dog in front of you.
If your dog remains bright, comfortable and able to drink, close monitoring may be enough. If they seem weak, painful or simply not themselves, call your vet sooner rather than later.
What to Do This Week
Review the warning signs in this article and make a quick plan: which symptoms would prompt you to call the vet today, and which would mean an emergency trip? Write it down and keep it somewhere easy to find.
When to See a Vet Urgently
Call your vet the same day if vomiting or diarrhoea continues, your dog cannot keep water down, there is blood in the vomit or stool, or your dog seems quiet, weak or uncomfortable. Seek emergency care for repeated unproductive retching with a swollen abdomen, suspected toxin, swallowed foreign object, collapse, severe pain or difficulty breathing.
This article is for educational purposes only and does not replace professional veterinary advice. If your dog is unwell, please consult your veterinarian.
Gut health is one of the seven pillars of canine longevity.
About the Author
Dr Kelly Yeo graduated from the University of Melbourne in 2009 and has extensive experience in companion animal medicine, with a special interest in geriatric care, chronic disease management, palliative care, and canine longevity.
Her work focuses on helping dogs live longer, healthier, and more comfortable lives through early detection, thoughtful nutrition, practical preventive care, and compassionate support for owners.
