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My cat has worms, loose stool, and blood. Is it from the worms?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Female | spayed | 2 years and 3 months old | 8 lbs

We noticed our cat was loosing weight then we saw she had worms. I ordered Bayer dewormer and gave her that today but before giving her this we noticed she had a loose stool and blood in it. We are very concerned. She is a small black cat and very clean and healthy. Could this just be due to the worms.

1 Answer

Most Helpful Answer

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Answered By Rebeccah Wood

Licensed Veterinary Technician, Registered Laboratory Animal Technologist

Published on July 31st, 2017

Hello there! Fresh, red blood in stool is usually due to irritation of the rectum, and yes, this could be caused by the worms. The soft stool can also cause this as well. A few drops of red blood in the stool is probably nothing to worry about, but I highly recommend having Lilu's stool checked for the type of worms she has as not all dewormers treat all worms. If the soft stools or blood continues, if she starts vomiting, or becomes lethargic, please bring her to the vet as soon as possible as she may have something else more serious going on. Good luck, and I hope Lilu gets better soon!

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