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.
2 Answers
Most Helpful Answer
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.
1Pet Parents found this answer helpful
Related Answers from Veterinarians
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Published on May 17th, 2018
Hello. Stress can certainly affect a cats appetite, but if he has lost enough weight that it is now of concern to you, the best thing is to have your cat evaluated by a veterinarian. Your cat may just be adjusting to his new surroundings, or perhaps he is getting more exercise & just seems leaner, but if you are worried it is always best to have these things checked out as soon as possible. Thanks for using Petco Pet Education Center, formerly Petcoach.
1Pet Parents found this answer helpful
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