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Understanding blood in your dog’s poop: Causes and what to do next

Should I worry if my dog has blood in their poo?

Yes – blood in your dog’s stool can be a sign of something serious. While there are several reasons why this might happen, some can be life-threatening. If you’re in any doubt, contact your vet or your nearest out-of-hours emergency pet clinic immediately.

What causes blood in dog poop?

There are many potential reasons why a dog may pass blood in their stool. These range from mild to life-threatening. Common causes for a dog pooping blood include:

  • Eating something inappropriate (dietary indiscretion)
  • Swallowing a foreign object
  • Trauma to the gastrointestinal tract
  • Sudden change in diet
  • Inflammatory bowel disease (IBD)
  • Anal gland problems
  • Parasites
  • Parvovirus (especially in puppies)
  • Hemorrhagic gastroenteritis
  • Tumours or cancer

What does the blood look like?

Recognising the appearance of the blood can help determine its origin.

Bright red blood in dog poop (Hematochezia)

This usually means the blood is fresh and from the lower digestive tract (like the colon or rectum).

Dark, tarry stool (Melena)

This suggests the blood is partially digested and likely comes from higher up the gastrointestinal tract, such as the stomach or small intestine.

Even the happiest pups need a vet check if there’s blood in their poop
Even the happiest pups need a vet check if there’s blood in their poop

When is blood in dog poop an emergency?

You should always seek advice from your vet, especially if your dog:

  • Is very young, very old, or has pre-existing health conditions
  • Has additional symptoms such as vomiting, diarrhoea, loss of appetite, or lethargy
  • Passes large amounts of blood
  • Has dark, tarry stools (a potential sign of internal bleeding)
Find an Emergency Vet

Find your nearest clinic for immediate treatment.

What should I do if I spot blood in my dog’s stool?

  • Don’t panic – stay calm and observe your dog
  • Note any other symptoms
  • If possible, collect a sample from the blood in the stool or take a photo of it
  • Contact your vet or out-of-hours clinic

Frequently asked questions about bloody dog poop

Can stress cause blood in dog poop?

Yes – stress or anxiety can cause gastrointestinal upset, including bloody stool.

Can worms cause blood in dog poop?

Yes – intestinal parasites are a common cause, especially in puppies or dogs that haven’t been wormed regularly.

Is bloody poop always serious?

Not always, but it should never be ignored. Even mild causes may require treatment, and serious issues can worsen quickly.