Thread: Help! Aggression problem

Thank you all so much for the excellent suggestions! They are definitely ones that my grandmother can put into practice, and I'll pass them along. And no, her cat is rarely left alone - it's just been during the rare need for a petsitter that this behavior started to manifest itself. It makes sense that he feels the need to defend his territory, but definitely not something we want to continue or escalate...

Thank you, again!!