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My dog's gas smells like peroxide/ammonia on antibiotics. Is it normal?

Updated on September 23rd, 2025

Pet's info: Dog | Great Dane | Female | spayed | 2 years and 6 months old | 132 lbs

Dog is currently on antibiotics and steroids for a bacterial infection (skin/coat) and allergy to grass. Her flatulence today smells very strongly of peroxide/ammonia. I am concerned. This is day 5 of taking these medications.

1 Answer

Most Helpful Answer

C. Rathjens, DVM

Answered By C. Rathjens, DVM

Veterinarian

Published on April 24th, 2017

The flatulence is gross and scary, but not medically dangerous. The antibiotics may by upsetting Freybug's stomach a bit. Don't stop the antibiotics, since they are important for clearing up her skin. You can give her some probiotics and feed her a bland diet of chicken and rice for a week to help settle her stomach. If she's having diarrhea or vomiting, let your vet know and they may be able to switch her to a different antibiotic. Good luck!
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