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My dog is on metronidazole. Can it cause runny stools or diarrhea?

Updated On September 23rd, 2025

Pet's info: Dog | German Shepherd | Female | unspayed | 1 year and 2 months old | 72 lbs

can metronidazole cause runny stools in dogs thanks

1 Answer

Most Helpful Answer

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Answered By Daniel Fonza, DVM

Veterinarian

Published on October 22nd, 2017

Hi there and thank you for using pet coach to address your concern. Yes, metronidazole can cause diarrhea. If you are seeing diarrhea or vomiting while on this antibiotic I would recommend discontinuing the drug and contacting the prescribing veterinarian to discuss this further. I hope this helps guide you in the right direction. Please let me know if you have any other questions or concerns. I would add in a probiotics such as Purina fortiflora as well.

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