Why is my cat suddenly aggressive and chasing my other cat?

Question

Abdul has been home for almost a year. He has recently started harassing Minnie (12lbs female) to the point he is chasing her through our house and cornering her. Its stressing Minnie out and I don't know *why* hes doing it. He has 3 other cats to play with that he frequently does play with, More toys? Other stimulation? Cat nip? Harness him and take him on walks? How can I figure out the why and how do I fix it? Pet's info: Cat | Mixed Breed | Male | neutered | 17 lbs

Dr. Melanie, BVSc MS · Accepted Answer

Having a health check with the vet is a good idea for Abdul. Sometimes when a cat suddenly becomes aggressive, ti can be a sign that he is ill. I'd take him into the vet in the morning. If he checks out health wise, try this method below to see if it helps. Best of luck. I would separate the cats, and slowly reintroduce them to each other. Take the cat who is aggressive, and put him in his own room with his own food, water, and litter box. Keep the door closed, and for a few days, feed them both treats on other side of door so they associate each other's smell with a good experience. Then let the other cat in the aggressive cat's room while the aggressive cat is in a cat carrier. They can smell each other, but not be in contact. If either becomes upset or show signs of aggression, remove the second cat from the room, and try again later. Praise them when they interact appropriately. When they are interacting well with each other through the carrier, you can let the aggressive cat out of his room, and see how he interacts with the other cat. Praise them when they interact appropriately, and separate them with any sign of aggression or upset. I would get a cat tree with lots of shelves to give the cats vertical space to get away from each other. I would keep the cat in his room when you go out until they are comfortable with each other. I hope this helps!

Why is my cat suddenly aggressive and chasing my other cat?

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