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Why does my cat randomly get aggressive, swat, claw, and pant?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | 1 year and 5 months old | 5 lbs

I asked a question last night and got an answer back saying it might be because my cat isn’t neutered but he actually is so I wanted to try asking again - he’s very loving but crazy and sometimes he randomly starts panting and gets a crazy look in his eye - it almost looks like he’s smiling but he’s angry. If I come close to him he starts swatting and clawing. He starts acting like he wants to attack me and It happens randomly- I’m not sure what’s wrong with him :(

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1 Answer

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Answered By Dr. Elizabeth

Veterinarian

Published on June 24th, 2019

Cats can exhibit some very confusing behaviors sometimes. From a behavioral stand point, this may be a form of rough play. Certainly some cats play rougher than what human skin can handle. He's young so he still has a very high energy level. Here are a few reasons cats will react aggressively. If you can identify a 'trigger' or lack there of a, it may help you to get a better understanding of the behavior: https://www.petcoach.co/article/5-tips-to-handle-an-aggressive-cat/ If this is rough play, you may try changing a few things in the environment which may help such as using a Feliway diffuser, setting aside 30 minutes a day for vigorous play for Bean or switching his food to Royal Canin Calm. Trying to meet his instinctual needs and keeping him entertained may also help: https://www.petcoach.co/article/why-every-cat-needs-a-place-to-climb/ https://www.petcoach.co/article/4-ways-to-play-with-your-cat/ If he insists on rough play, get a large stuffed animal and see if he will use this as a substitute to attack. An interactive cat toy may also help. The veterinarian can also prescribe medications which can help with behavior if needed. You noted that he pants sometimes. Cats can pant with exertion but if you are noticing the behavior without an obvious cause, have him examined by the veterinarian to check his heart for any signs of hypertrophic cardiomyopathy. https://www.petcoach.co/article/feline-hypertrophic-cardiomyopathy/ I hope this helps and please feel free to post any additional questions.

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