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Blood in your dog's stools


Seeing blood in your dog’s stool (poo) can be worrying because most people associate it with serious illness.

It is always something to get checked by your vet but don’t panic, there are lots of possible causes ranging from very minor to more serious.

It can be very helpful to take a stool sample or a photograph of your dog's stool to show your vet. 


What does blood in a dog's stool look like?

Blood in your dog’s poo can range from:

  • Bright red streaks 
  • A black tinge throughout the whole poo (see photographs)
  • Blood dripping from your dog’s bottom after they have been for a poo.
Photograph blood in poo and black poo,

Blood in a dog's poo and black poo (digested blood)

Why is there blood in my dog's stools?

Some of the conditions that cause blood in your dog's poo are listed below:

Illustration of a dog's stomach

Blood in your dog’s poo might be coming from their: stomach, intestines, colon, anus (bottom) or anal glands. Click image to enlarge.

When to contact your vet

It’s always best to contact your vet if you see blood in your dog’s poo. Most of the causes are minor or pass quickly but some are more serious and need immediate veterinary attention, such as parvo and gut blockages

It can be helpful to collect a sample of the poo show to your vet (or even a photograph if a sample isn’t possible).

You know your dog best. If they don’t have the symptoms listed above but you are still concerned it’s always best to contact your vet.

Published July 2018

PetWise Pet Health Hub – brought to you thanks to support from players of People’s Postcode Lottery 

Written by vets and vet nurses. This advice is for UK pets only.

Illustrations by Samantha Elmhurst