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.
- Contact your vet if you find blood in your dog’s stool, 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 poo sample or a photograph of your dog's stool to show your vet.
Why is there blood in my dog's stools?
Some of the conditions that cause blood in your dog's poo are listed below:
- Parvo (parvovirus) or another virus
- Anal gland problems
- Colitis (inflammation of the large intestine)
- Haemorrhagic gastroenteritis (HGE)
- An upset stomach from eating something they shouldn’t have, or something that is toxic
- Worms or another parasite
- Stomach ulcer (this can sometimes be a side effect of non-steroidal anti-inflammatory drugs)
- Bacterial gut infection (e.g. Salmonella)
- A rectal polyp (a harmless mass sitting just inside the bum)
- Anal furunculosis
- Food allergies
- Inflammatory bowel disease
- Gut blockage (foreign body)
- Mass around the anus (bum)
- Mass in the stomach or guts
- Bleeding/ clotting disorders.
When to contact your vet
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).
Published: June 2019
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Written by vets and vet nurses. This advice is for UK pets only. Illustrations by Samantha Elmhurst.