My 9 month old neutered male BSH cat (Arnie) is being tormented by a neighbour's cat which is a much larger long-haired male...possibly part ragdoll although I am no expert. This cat is clearly the dominant one (older and bigger so understandable). It only started a few weeks ago. At first the cat just chased Arnie out of our garden....then he started to chase him up trees and wait at the bottom growling until we chased him off to get Arnie down...now he is coming into our house...through open windows or doors..eats all Arnie's food and won't let him in or traps him upstairs if already inside. It even waits outside our back door and meows to come in as if it lives here! We have tried spraying it with water, dousing it with water from a bucket, squirting lemon juice at it...all to no avail. It comes back 5 minutes later as though nothing has happened. Is not frightened of us at all and is in fact very placid with people. I don't really want to be feeding a second cat premium cat food whilst having Arnie a prisoner up a tree or in my bedroom! He is clearly getting very distressed by it all. Any ideas?! Please help!