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Why is my cat losing weight after a new cat joined? Stress or age?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Longhair | Female | spayed | 2 years old | 10 lbs

I have noticed within a month/month 1/2 that Jayden has lost weight. No food/treat changes. I brought her Mom, Lil Stinker home in Feb 2018. They are adjusting well. Jayden has a thick coat and I try to brush her everyday. She has had some matting, which I cut off and con't to brush often. I'm just concerned about her weight loss. She used to be very healthy! I'm not sure if she was upset about Mom being here or if it's normal as she gets older. She had lose stool 5/29. And none today.

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1 Answer

Most Helpful Answer

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Answered By Maria DVM

Veterinarian

Published on May 30th, 2018

It may be that Jayden is now more active with another cat in the house. If you are concerned I would recommend a visit to your vet with some blood work just to be sure. Thank you for using Petco Pet Education Center, formerly Petcoach.

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