What are theSide effects of a dog taking penicillin?

Answer:

Roughly the same as a human's. Any antibiotic is designed and intended to kill off micro-organisms, in hopes of nailing the one that's making your dog sick. However, many other harmless -- and sometimes helpful organisms are kiled as well.

So you can expect diarrhea for a start, until a few days after the course of medication is over.

First answer by Cjonb. Last edit by Cjonb. Contributor trust: 1198 [recommend contributor recommended]. Question popularity: 1 [recommend question].