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Why does my Shih Tzu have black poop while taking antibiotics?

Updated On September 23rd, 2025

Pet's info: Dog | Shih Tzu | Male | 6 months and 11 days old | 3.3 lbs

My shih tzu hasn't been drinking or eating so we started to feed him by syringe. But just now, I saw him drinking water (still didn't touch his food). He's currently taking antibiotics because the vet set he has a very low platelet count (59). We also noticed the his poop started to be different. It became dark brown liquid and we saw black drops in it. Does this have anything to do with him taking antibiotics? Is it good or bad? Thank you!

1 Answer

Most Helpful Answer

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Answered By David Elbeze, DVM, MRCVS

Veterinarian

Published on August 6th, 2017

Black stools is usually a sign of bleeding from the stomach or small intestines, it's definitely not a good sign and is not likely to be due to the antibiotics. i would recommend taking Curt back to the vet ASAP for re-evaluation of the situation.

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