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My cat suddenly attacked her housemates. How do I stop the aggression?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Female | spayed | 8 years and 2 months old | 7 lbs

I have three cats - Ripley (8) and siblings Bishop and Ash (1.3 years) and they have been best of friends since I introduced the boys to Ripley. Sunday night all changed...Ripley attacked both boys in a rage after I returned home. It seemed they were sniffing my flip flops and tails puffed and she attacked. This continued through the night and Ripley had to be taken to the vet as she damaged a few claws from getting stuck in carpet. Cats have been separated as attacks happened again. No idea

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1 Answer

Most Helpful Answer

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on July 11th, 2017

Keep them separated for a few days. Gradually introduce one to another then introduce the third. A pheromone product such as Feliway spray or plug in diffuser may decrease any anxiety or aggression in the home. As the instigator, have Ripley examined by your veterinarian to diagnose illness or injury. Either can cause sudden behavioral changes. (Love the names for your trio. "Alien", great movie franchise)

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