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Why is my cat pooping bloody diarrhea? Worms, new food, or illness?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 2 years and 9 months old | 15 lbs

My cat Ron has been pooping diarrhea with blood. He does have roundworms, wondering if this is the cause ? Or if it's because I changed his food brand.

1 Answer

Most Helpful Answer

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Answered By Makenzie Kurth, DVM

Veterinarian

Published on June 15th, 2018

Thanks for using PetCoach. Both roundworms and a sudden change in diet can cause diarrhea with blood. I'd recommend treating the roundworms with something like this. https://www.petco.com/shop/en/petcostore/product/cat/cat-health-and-wellness/wormers-for-cats/excel-roundworm-cat-de-wormer Consider adding a probiotic like Forti-Flora to help as well. If no improvement in 3 days of treatment - or worsening at any time, its time to see your vet. Best of luck to you and Ron!

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