By Dial A Vet Veterinary Team
Finding diarrhoea on the floor, or watching your dog strain urgently in the yard, raises an immediate question: can this wait, or do we need a vet now? For many adult dogs, a short bout of diarrhoea settles with simple care. For puppies, older dogs, and dogs showing other signs of illness, it can become serious quickly. This page gives you a step-by-step plan for the first 24 to 48 hours. For background on the types and causes, see diarrhoea in dogs: types and causes.
Key takeaways
- Start with a quick check: energy, gums, vomiting, blood in the stool, belly pain, and any chance your dog ate something toxic.
- Keep fresh water available at all times. Dehydration is the main short-term risk.
- Puppies with diarrhoea, especially unvaccinated puppies, should be seen by a vet the same day.
- Call a vet if diarrhoea lasts more than 24 to 48 hours, keeps coming back, or your dog seems unwell.
- Do not give human anti-diarrhoeal medicines or leftover antibiotics.
Step 1: Check whether this is an emergency
Go to an emergency veterinary hospital now if your dog:
- Has a lot of blood in the diarrhoea, or black, tarry stools
- Is vomiting as well, especially more than once, or cannot keep water down
- Is weak, flat, collapsing, or has pale, grey, or very dry gums
- Has a tense, painful, or swollen belly
- Is a young puppy, or is unvaccinated (parvovirus is a risk)
- May have eaten a toxin, medication, bones, or an object
- Is very small, elderly, or has a medical condition such as diabetes, Addison's disease, or kidney disease
If none of these apply and your dog is bright, playful, and drinking, it is usually reasonable to monitor closely while you follow the steps below.
Step 2: Keep water available
Make sure your dog can always reach clean, fresh water. If your dog is drinking normally and not vomiting, that is a good sign. If they refuse water, drink and then vomit, or seem to be drinking huge amounts, contact a vet. Do not force fluids into your dog's mouth.
Step 3: Talk to your vet about food
Advice on feeding during diarrhoea has changed over the years. Long fasts are no longer routinely recommended, and puppies and small dogs should never be fasted without veterinary advice because their blood sugar can drop. Many vets suggest small, frequent meals of a gentle, easily digested food for a short time, then a gradual return to the usual diet. Ask your vet what suits your dog. Our page on what you can give a dog with diarrhoea covers this in more detail.
Step 4: Keep notes
Write down when each episode happens and what it looks like, and take a photo. Note:
- Frequency, consistency, and colour
- Any mucus or blood
- Straining or accidents inside
- Appetite, vomiting, and energy
- Anything new your dog ate, any recent stress such as boarding, and any medications
These details save time and help your vet decide which tests, if any, are needed.
Step 5: Practise good hygiene
Pick up stools promptly, wash your hands, and clean soiled bedding. Some causes of diarrhoea, including Giardia and certain bacteria, can spread to other pets or people. Keep a dog with suspected parvovirus away from other dogs and public areas.
When to book a vet visit
Even without emergency signs, book a consult if:
- Diarrhoea lasts more than 24 to 48 hours
- It keeps coming back over weeks
- Your dog is losing weight or eating less
- There is a small amount of blood or mucus that does not settle within a day
- Other pets in the household are also affected
What the vet may do
Your vet will examine your dog and may recommend a faecal test for worms and Giardia, blood tests, a parvovirus test for puppies, or imaging. Treatment is based on what they find and how unwell your dog is. It might include fluids, anti-nausea medication, deworming, a short-term diet, or a vet-approved probiotic or fibre supplement. Antibiotics are not needed for most cases of simple diarrhoea.
FAQ
My dog has diarrhoea but is acting normal. Should I worry?
A happy, hungry dog with mild diarrhoea can usually be monitored for a day or two with good water access. If it does not improve, or your dog changes, see a vet.
Can I give my dog an anti-diarrhoea tablet from the pharmacy?
No. Human anti-diarrhoeal products can be unsafe for some dogs and can hide signs of a serious problem. Ask your vet first.
Should my dog stay away from other dogs?
Until you know the cause, it is sensible to avoid dog parks, daycare, and boarding.
Talk with a vet
If your dog has diarrhoea and you want help deciding whether to wait or go in, our vets can go through it with you by video. Book a consult at dialavet.com. If your dog has any of the emergency signs above, go to your nearest emergency vet hospital.
References
- Merck Veterinary Manual. Diarrhea in Dogs and Cats.
- Jessen LR, et al. ENOVAT guidelines for antimicrobial use in canine acute diarrhoea. The Veterinary Journal, 2024.
- American Veterinary Medical Association (AVMA). Canine Parvovirus.
Disclaimer: Educational only. This page does not replace an examination or advice from your own veterinarian. If your pet has bloody diarrhoea, is vomiting, or seems unwell, contact a veterinary hospital promptly.
