Why does my male cat attack my female cat after her vet visit?

Question

When my female cat is in the carrier to go to vet and comes back, my male cat goes ballistic on her.... chases her, stalks her, hisses, wails, attacks her with his claws. This has gone on for a week and a half. It's worse this time. He usually only does it for two days. My female is completely stressed. Iv put him in another room and reintroduced to no avail. I spray him with water and it just doesn't stop. They both are healthy. I'm at my wits end. Even the vet has no ideas. Pet's info: Cat | Domestic Shorthair | Female | spayed | 8 years and 1 month old | 10 lbs

Dr. Strydom, DVM · Accepted Answer

This happens quite a bit actually. Could be territorial aggression - she left and now he is trying to tell her the house is his OR it could be that he feels threatened due to the way she smells when she returns. I suggest you start using some Feliway products. I would spray the carrier when you take the cats to the vet and use the diffusers (multicat) in the house. ( https://www.feliway.com/us ) ( https://www.feliway.com/us/Why-Use-Feliway/how-to-stop-cats-fighting )

Why does my male cat attack my female cat after her vet visit?

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