Dog Diarrhoea: What to Do at Home and When to Call the Vet
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A single loose stool in an otherwise bright, hungry adult dog is common and often settles within a day or two. Diarrhoea that comes with vomiting, blood, lethargy or a very young or very old dog is a different matter and calls for a phone call to the vet. The skill is in telling the two apart. This guide sets out sensible first steps, using mainstream advice that most UK vets would recognise, but it cannot replace a vet who knows your dog. If you are unsure, ring the practice. Most will triage over the phone.
The first hour: check the dog, not just the stool
Look at the whole dog before the mess. Is it alert, interested in you and drinking normally? Is its belly soft or tense? Are its gums a normal pink and moist? A dog that seems like itself is in a better position than one that is hunched, quiet or restless.
It helps to note a few things you can pass on to a vet:
- how many times and over how long
- the colour and texture, and any blood or mucus
- whether there has been vomiting
- anything new it might have eaten, such as scraps, a new chew, bin raiding or a sudden food change
- whether worming and vaccinations are up to date
A quick photo of the stool is something vets often find useful.
Water first
Diarrhoea loses fluid, so fresh water should always be available. Offer small amounts often if the dog is reluctant to drink. A dog that refuses water, or drinks and immediately vomits it back, needs a vet the same day.
Food: what vets commonly suggest
Opinions have shifted over the years on whether to withhold food. Some vets advise a short rest from food for a healthy adult dog, and many now prefer to keep feeding small, plain meals. Either way, it depends on the dog. Do not withhold food from puppies, toy breeds, very old dogs or any dog with another condition without asking a vet first, because they can run low on energy fast.
If a vet suggests a bland diet for a short spell, a common recommendation is a plain, easily digested meal in small portions, offered several times a day rather than one large bowl. Ask what your vet would use and for how long, because "bland" is not a recipe and a long period on a home-cooked diet can be nutritionally incomplete.
When stools are firming up, go back to the normal food gradually, mixing it in over several days instead of switching in a single meal. Our guide on switching your dog's food without an upset stomach explains the process.
Signs that mean ring the vet today
Do not wait and see if you notice any of the following.
| Sign | Why it matters |
|---|---|
| Blood in the stool, or black, tarry stool | Can point to bleeding in the gut |
| Repeated vomiting | Dehydration risk rises quickly |
| Lethargy, weakness or collapse | The dog is not coping |
| Swollen, tight or painful belly | May need urgent attention |
| Pale or dry gums, sunken eyes | Possible dehydration |
| Refusing all food and water | A sign of a more serious problem |
| Diarrhoea lasting more than a day or two | Needs finding a cause |
| Known or suspected swallowing of a toxin, foreign object or chocolate | Time-sensitive |
If your dog has eaten something it should not have, call your vet or an out-of-hours service immediately and take the packaging with you.
Higher-risk dogs
Some dogs get less leeway. Puppies can become dehydrated and weak very quickly, so call the vet early. Unvaccinated or part-vaccinated puppies with diarrhoea should be seen promptly because parvovirus is a risk, and it is one reason the first vaccinations matter. Our puppy first vet visit guide covers that schedule. Senior dogs, tiny breeds and dogs with existing conditions such as kidney disease or diabetes should also be seen sooner rather than later.
Where a gut paste fits
Some owners keep a probiotic paste in the cupboard for mild upsets. Protexin Pro-Kolin Advanced is a dog paste whose listing describes biotic support for the gut, ingredients to firm up poos and a dosage wheel on the syringe. Those are the maker's claims. A paste is something to ask your vet about, rather than reach for in place of an assessment, particularly if the dog is young, old or unwell. The listing does not make it a treatment, and diarrhoea that persists needs a cause found rather than a product tried. Our guide to when a probiotic might help and Pro-Kolin Advanced review go into more detail.
Keeping the house and family safe
Dog diarrhoea can carry germs. Pick up stools promptly with a bag, wash your hands afterwards, and keep children away from the mess. Clean floors with a pet-safe disinfectant, and wash bedding on a hot cycle. If the dog has been unwell, avoid dog parks and other dogs until the vet says it is fine.
What usually happens
Most mild cases in healthy adult dogs improve within a couple of days with water, rest and careful feeding. When they do not, or when any warning sign above appears, the next step is the vet, not another supplement. This article is general information and not a diagnosis.
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