Hi all, I have two cats, Boo-3 and Bella-2. Bella has always been playful and lovable, Boo is a little more independent but lovable and used to occasionally play well with Bella. Now Boo has turned into a complete bully with Bella - to the point that Bella is biting two spots on her back (hot spots). Bella is constantly looking behind her back to see if Boo is nearby. When she is in bed with me cuddling and suckling, she will constantly stop, turn her head to see if Boo is nearby. Boo will chase her down and rough house way too aggressively. How can I stop Boo from being such a bully?