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My old cat has diarrhea and purple blood in her poop. Is it serious?

Updated On September 23rd, 2025

Pet's info: Cat | Maine Coon | Female | spayed | 6 lbs

My cat has a had diarrhea on and off for a few days. She has been to the vet , got blood work and had a fecal test. All good , but she hadn't been eating and is now on a different food but eating well and looks good (she's 20). We noticed a little bit of purple blood in her poop (pic attached). Is this serious ? I know the diarrhea is probably from the change in food but towards the end of her pool looks a little purple. (Not normal)

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1 Answer

Most Helpful Answer

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Answered By Dr. Strydom, DVM

Veterinarian

Published on December 26th, 2018

I wouldn't really be worried about this at this stage. The purple color may be a bit of digested blood but it could also be due to some colon irritation. I suggest you continue what you are doing and if it persists then you should call your vet to ask them about it. They have more information about her health than we do. My only other suggestion is to put her on a probiotic: like Advita or Fortiflora. This should help with the diarrhea. ( https://vetapprovedrx.pharmacy/advita-powder-for-cats.html ) The box has 30 packets - put one packet on her food once daily for 30 days. It is very palatable so there should be no issue with her eating it. It may even entice her to eat better. Hope this helps. Best wishes.

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