I have a 7 year old cat, Toby, who is sort of aggresive towards other cats and territorial, although he was neutered when he was young. I have a 4 month old kitten that we lately introduced, and Toby will attack her if she gets close to him. They see eachother all the time, and ive done the room method, with only visual contact, but the kitten keeps on trying to bother him from curiousity and keeps on getting scratched. Help?

PS: They are both indoor and outdoor cats.