We have four cats. Sergio is a huge black boy, terrified of men, scared of most other people. Belladonna is a sweet, quiet, delicate, sweet himalayan princess. For some strange reason, Sergio has started chasing Bella and ripping out her fur. So Bella hides alot. All our cats are neutered asap. Please someone help us. Poor Bella has terrible knots all over from Sergio's bad behavior.