Petco Text Logo
Petco Pet Logo

  • Two Easy Ways to Start Earning Rewards!

Why is my 10-yr-old cat suddenly attacking new cat? Is he sick?

Updated On September 23rd, 2025

You I have a cat that is roughly 10 yrs old he is a Male few months ago we got another older female cat both are fixed..recently our Male cat has been attacking our female I mean really attacking her...I am worried that there maybe could be something wrong with his brain like a worm or old age..he gains weight and loses it his eyes have become watery in last couple days his temperament has trasticly changed he is attacking up biting scratching just out of the blue laying next to him he will turn

This question includes photos that may contain sensitive content. Click to view.

View more to consider that the photos may include sensitive content.

1 Answer

Most Helpful Answer

Image profile

Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on June 24th, 2019

A sudden change in behavior from the normal, including suddenly being aggressive, can be a sign of a medical illness. I would recommend having him seen by a vet in the morning for a health check. By the way, I love the picture of them in their beds in front of the fire. So cute!

Vote icon

1Pet Parents found this answer helpful

image
Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Book Now

Sponsored