My neutered cat mounts his sister. How to stop their fighting?

Question

We adopted a girl and boy kitty from the same litter when they were about 2 months old. They were already spayed and neutered. The boy has periodically tried to “mount” his sister, but we didn’t worry about it too much because he never hurt her. Now they’re a year old and it’s still happening—- and last night it turned into a full-blown fight, fur flying, and the girl ended up with a couple of nasty scratches. They are both cuddly sweethearts otherwise and love each other! How do we stop this!?? Pet's info: Cat | Domestic Shorthair | Male | neutered | 1 year and 1 month old | 10 lbs

Penelope Graben, DVM · Accepted Answer

Hi there! Behavioral issues in cats can definitely be frustrating. Obsessive mounting can often be attributed to underlying anxiety. I would recommend trying an anxiety reducing pheromone product called Feliway. It comes in diffusers, sprays, and collars and often helps multi-cat household behavior problems. If there is no improvement with Feliway, I would recommend talking to your vet about putting Max on a trial of anti-anxiety medication to see if that helps.

My neutered cat mounts his sister. How to stop their fighting?

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