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My cat has dark, runny stool and is acting strange. What's wrong?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Male | neutered | 13 lbs

Hi, my cat is acting different from usual and it's stressing me out pretty significantly. He's eating and drinking and he's been using the litter box, but his stool is very dark and runny and I haven't noticed if he's urinated. Please help ASAP!

1 Answer

Most Helpful Answer

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Answered By Andrea M. Brodie, DVM

Veterinarian

Published on October 22nd, 2018

Diarrhea can have many causes such as a problem with the stomach and intestines caused by a food oversensitivity, eating something that does not agree with your cat, intestinal parasites, an intestinal blockage, bacterial infection, viral infection, the weather, food change, stress, hyperthyroidism, kidney and liver disease. As you can see this is complicated and I suggest you take Big Kitty to your vet for a hands-on exam and some diagnostics to find out why he has diarrhea and to hopefully find the cause and treat it.

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