How to Cure Dog Diarrhoea: Causes, Prevention, and Medicine for Dogs

A close-up, square-format photo of a small, white and brown Jack Russell Terrier mix lying on a grey blanket during a veterinary exam. The dog looks slightly anxious. A person wearing blue nitrile gloves has their hands resting gently on the dog’s back, while a black stethoscope sits in the blurred foreground.

Our expert advice

Diarrhoea in dogs can be caused by a variety of things, but most cases are related to food. Common triggers include a sudden change of diet, too many rich treats, eating something unsuitable on a walk, or a food allergy/sensitivity.

It can also be caused by infections, including internal parasites (worms), viruses such as Parvovirus, and bacterial infections.

To help reduce the risk of diarrhoea, keep your dog’s diet consistent, limit rich treats and keep an eye on anything they may scavenge on walks (like fox poo, rubbish etc). Regular worming treatment can also reduce the risk of parasitic infections.

If your dog has diarrhoea but is otherwise well, feeding a bland diet in small, frequent meals may help settle their stomach. Over-the-counter probiotics may also shorten the duration in some cases.

If your dog is off their food, vomiting, lethargic, or the diarrhoea lasts for 3 days or more, they should be seen by a vet. Dogs with severe diarrhoea (very watery or contains blood) should see a vet as soon as possible, as dehydration can be very serious.

One of the most serious cause of symptoms is Parvovirus (parvo.) This highly contagious and deadly virus spreads through infected faeces and can survive for months in the environment. Symptoms include diarrhoea, vomiting, lethargy, and fever, and affected dogs can become very unwell quickly.

Early veterinary treatment gives them the best chance of survival. Vaccinations provide effective protection against Parvovirus, it’s included in puppy vaccinations and annual boosters, so they should be kept up to date.

Most cases are caused by dietary upset or viruses, so antibiotics are not usually needed and are only used if a bacterial infection is confirmed or suspected. 

More information

A dog’s gut microbiome (the community of good bacteria that lives in the digestive system) is unique to each dog, almost like a microbial fingerprint. it’s influenced by factors such as genetics, diet, age and environment, and plays an important role in digestion, vitamin production, and supporting a healthy immune system.  

A wide-angle photo of a small white and tan dog resting on a grey blanket on a black examination table. A veterinary professional in blue gloves is palpating the dog's side, and another person in a green shirt stands to the left. A stethoscope is visible in the lower-left foreground, emphasizing the clinical setting.

Three things you can do today

Check vaccinations

 Check that your dog is up to date with vaccinations and worming treatment. Keep in touch with your local vets to stay informed about any Parvo outbreaks.

Look for changes

If your dog has Diarrhoea frequently, speak to a vet or vet nurse about any dietary changes that may help. 

Think hygiene

Always pick up your dog’s poo and dispose of it correctly. If any friends or neighbours’ dog has diarrhoea, keep your four-legged friend away from them until they’re better.

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