Petco Text Logo
Petco Pet Logo

Why is my dog's poop dark after starting Apoquel medication?

Updated On September 23rd, 2025

Pet's info: Dog | Maltese | Female | unspayed | 2 years and 7 months old | 7 lbs

My dogs stool is dark and she was put on apoquel 2weeks ago could this have anything to do with it?

1 Answer

Most Helpful Answer

Image profile

Answered By Andrea M. Brodie, DVM

Veterinarian

Published on May 1st, 2018

Dark stool is usually not a problem unless the stool looks tarry. Tarry looking stool contains digested blood which could be from feeding raw meat, or stomach or intestinal bleeds. Apoquel's most common side effects are vomiting and diarrhea. Intestinal or stomach bleeding is not listed. If you are also giving other medications this will need to be investigated. Please take a stool sample to your vet if you suspect it has a tarry appearance, If the stool is just dark brown, it is quite normal and nothing to worry about.

Vote icon

2Pet Parents found this answer helpful

image
Have A Vet Question?

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

Sponsored