We used to have this problem at our old house before we moved six months ago. My female cat, is very passive. We had a neighbour who had lots of sausage dogs, and lots of cats. Basically if the cats wanted some peace to do their business in the garden or roam around they would come to our house. We had no dogs at the time to chase the cats away. Problem was a large male tom that would come into our house and bully our cat. One day we came home to blood all over the kitchen and balls of my cats fur pulled out (my cat is beige, the tom was black) and urine everywhere. My cat was beaten and hiding under my bed. This was the last straw. Sadly, when I spoke to the neighbour, she was very non chalant about the affair, it was the one time I really lost my cool and threatened to shoot an animal. We got a dog a while later and that sorted the issue out.
