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Why is my cat's diarrhea olive green after another cat died?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Male | neutered | 4 years and 2 months old | 12 lbs

My 4 y/o grey tabby started having diarrhea yesterday afternoon. No new food, eating & drinking normally. The only thing that has changed is our 18 y/o cat passed away a week ago. He has had 2 episodes of diarrhea in less than 24 hours. It's olive in color. Could it be stress from our other cats passing? There are 2 other cats in the household including Keanu.

1 Answer

Most Helpful Answer

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Answered By Jessica Desrosiers

Veterinary Technician

Published on May 11th, 2021

Stress can definitely cause changes in eating, drinking, and stool habits, however the green color makes me worry that there may be an underlying health issue as well. Green stools can sometimes indicate issues such as too-fast of transit time in the bowels (so the normal bile isn't broken down into its usual brown color), liver or gall issues, pancreas issues, illnesses caused by bacteria, or ingesting something that is greenish or dyed in color. I would offer Keanu a bland diet of some boiled chicken to see if that helps resolve the diarrhea (and give him some extra attention and care, since cats deal with loss and grief just as much as people) and continue to monitor his stools. If the diarrhea or strange stool colors continue, bringing Keanu and a sample of his stool to your vet is a good idea to rule out more serious issues.

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