Thread: Help! Aggression problem

I'm writing on my grandmother's behalf. Her beloved 5 year old Maine Coon fixed male has, within the past year, started displaying some disturbing aggressive behaviors. At first it was the (very well-known to him) pet sitter towards whom he acted aggressive and intimidating - hissing and spitting, very confrontational. She has since refused to care for him. He then bit my aunt when she came by to feed him when my grandmother was away for a weekend. He leapt at her back and sunk his teeth into her arm. Obviously it was stressful to have his main person gone and to be left at home alone, but he knows both these women very well. (When left alone, he has access to lots of fresh water, toys and scratching posts, and a clean litter box, the radio is left to play quietly, and someone well-known comes by several times a day to feed, clean his litter box, and check on him.) Most recently, he bit my grandmother when she didn't feed him immediately when he was begging for food (it was not meal time).

He has been checked thoroughly by his vet and is in good health. The vet's recommendation, as well as that of his breeder, was that my grandmother should get a kitten so that he'll have company and a playmate. While this sounds like a good idea, it's not possible. Nothing changed in his life or living situation prior to these behavior changes. And unfortunately the behavior seems to be worsening. Any advice would be very much appreciated!!

Thank you!