Tater Dude has always been very sweet. But over the past year, he has started picking fights with other cats, especially Thumper. Thumper has always been kind of a bully all her life, and for that reason the other cats are afraid of her. She's just really spoiled, used to getting her way and is kind of a loner when it comes to other cats. That's just always been her nature. Other cats in her family were similar. But Dude never used to do this. He picks fights with Thumper more than the rest and she hates him very much, because he is the only one that stands up to her now. But they are constantly fighting. He bullies the other cats too though. He chases them, picks fights with them, and growls and hisses at them - usually just whenever he feels like it. If they (other than Thumper)walk up to him when he's in a good mood everything's fine and he doesn't bother them. The only one he won't bother is Pretty Kitty, his mother. He loves her VERY much and gets along with her really good. Is there anything I can do to make him stop being such a bully around the other cats - or should I just let them work it out on their own?