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My guinea pig's poop smells bad. Is it diarrhea or a health issue?

Updated On September 23rd, 2025

Pet's info: Small Animal | Unknown - Small Animal | Male | unneutered

I have noticed a very bad smell in my guinea pig Boog’s feces and I was wondering if it’s a deeper health issue. I feed him fresh water, fresh pellets, and hay everyday and fresh veggies twice a day. He shares the cage with Archie (my other guinea pig) and I just want to make sure that if Boog does have something that it isn’t contagious to Archie. If possible, may I treat it at home or will I have to visit a vet? Also, how can I tell if it’s diarrhea or regular poop?

1 Answer

Most Helpful Answer

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Answered By Lauren Kennedy, DVM

Veterinarian

Published on August 18th, 2018

Hi there, I’m sorry to hear that Boog isn’t well. He should have normal, formed, firmed fecal pellets. If the feces is slimy or unformed, it is abnormal. If the feces is abnormal than I would recommend taking a fecal sample in to be tested. Likewise, if you cannot find the source of the smell, you should take Boog in to be examined to make sure nothing too serious is going on. I hope this helps. Thanks for using Petco Pet Education Center, formerly Petcoach. Best of luck.

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