Petco Text Logo
Petco Pet Logo

Why is my senior cat suddenly aggressive, disoriented, not listening?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 9 years old | 23 lbs

Hello. I have a male neutered cat that just turned 9 yesterday. Lately he has been showing some confusing and irritating behavior. He used to listen when we would tell him "out" if he was standing in the middle of the way, he refuses to listen. He also hisses very easily, he never used to. Whenever he sees my female dog (been here for almost 2 years) he follows her to pick a fight with her even if her attention was not on Him At All.Maybe A BitDisoriented,constantlyFollowingUs, BumpingIntoThings

1 Answer

Most Helpful Answer

Image profile

Answered By Jessica Desrosiers

Veterinary Technician

Published on March 25th, 2019

Aging related issues in senior pets can sometimes cause the symptoms you are seeing, as well as underlying illness or even pain from issues such as arthritis. A good first step would be to bring Pete to your vet for a senior checkup, which may include additional tests such as bloodwork or X-rays, to rule out any health issues that could be causing the behavior changes. Senior pets can also get dementia and other issues much like people can. If he checks out healthy, speaking with a trainer or veterinary behaviorist in your area may also be beneficial as they may be better able to assess and address the issue in person.

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.

Sponsored