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Why is my dog's poop runny with blood but he's acting normal?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Male | 1813 years and 6 months old | 55 lbs

My dog had a normal stool but it became runny and he had bloody mucus at the end. He has been eating normally and is active.

1 Answer

Most Helpful Answer

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Answered By Dr. Macartney, BVet Med, MRCVS

Veterinarian

Published on July 25th, 2017

I am very sorry to hear that Buddy is experiencing this issue, I am sure it is unsettling. From what you are describing, a normal bowel movement which becomes liquid and has fresh blood in it, it sounds as though Buddy has colitis, or inflammation of the last portion of the large intestines. There are several causes of colitis in dogs, ranging from bacterial infections, parasite infestations, IBD, or ingestion of contaminated food. Since you have only noticed one such episode I would continue to monitor Buddy at home. Provide a bland diet of boiled boneless chicken breast and white rice and plenty of fresh water. If the episodes continue, if Buddy becomes depressed, passes large amounts of blood, vomits, or seems very uncomfortable take Buddy to see his vet. I hope this answer was helpful and more importantly that Buddy feels better soon. Warmest regards to you both.

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