Petco Text Logo
Petco Pet Logo

Why is my dog pooping red tarry substance after having diarrhea?

Updated On September 23rd, 2025

Pet's info: Dog | Shih Tzu | Female | spayed | 3 years and 10 months old | 11 lbs

Tarry red substance from dogs bottom. She had a day of being sick and runs. Now this. Eating and drinking ok

1 Answer

Most Helpful Answer

Image profile

Answered By Susan England-Foster

Veterinarian

Published on August 28th, 2017

Poor maddie. Sometimes if a pet has diarrhea it will cause irritation of the colon which will cause a bright red color. However there can also be blood from an anal gland infection. I would recommend taking her to a veterinarian for an exam and medication to resolve the diarrhea and blood. Also they can check her anal glands. You can try an over the counter probiotic too. Hope she feels better soon

Vote icon

1Pet Parents found this answer helpful

image
Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Sponsored