Why is my cat chasing my other cat? How to stop cat aggression?

Question

Hello! I have two cats, Kosinus and Kamikaze. They're about 3 years old, sisters and castrated. They had a great relationship until two years ago. Kosinus is constantly chasing Kamikaze out of the house. Kamikaze is living part time with our neighbours because of this, and we're getting a bit tired of it. Can you please tell me why Kosinus is bahaving like this and if there is anything we can do to make the situation better. Regards from a desperate teenager. Pet's info: Cat | Norwegian Forest Cat | Female | spayed | 3 years and 11 months old | 6.6 lbs

Jessica Desrosiers · Accepted Answer

Stress and illness can be two factors in sudden behavior changes in cats, so getting Kosinus checked out by your vet is a good first step. Cats that are in pain or sick may suddenly lash out at friends or other pets when they were normally friends. If Kosinus checks out healthy, then looking for stress factors is the next step. Do the two cats have to share one food or water bowl? One litter box? One bed or perch? These can be things that may become contested, and if one cat is pushing the other out may lead to aggressive behavior. Making sure there are multiple litter boxes, beds, and food and water dishes may help. Pheromone diffusers that can be plugged into walls of shared rooms or used as a collar can also be useful for decreasing stress and aggression among cats, and may help Kosinus calm down some and get along again.

Why is my cat chasing my other cat? How to stop cat aggression?

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