Petco Text Logo
Petco Pet Logo

My senior dog has black poop, upset stomach, and won't eat. Is it serious?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Female | spayed | 35 lbs

Dog is 10yrs and once a week her stomach is upset (noises and gas), is she exhausted, she doesn’t eat breakfast or dinner, and her poop is very black in colour.

1 Answer

Most Helpful Answer

Image profile

Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on September 19th, 2019

This isn't normal. The dark color of the poop indicates bleeding in the upper GI tract, and it could be caused by a GI ulcer, GI illness, or something more serious like a cancerous growth. I'd have Boli seen by a vet in the morning.

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