I just had to have my Maine coon cat shaved & an open wounded operated on. Since he's home another cat is a terrible bully attacking him biting his butt. He was very long haired, would not let us groom him so the 'bully' apparently gave him the wound that we could not see until it abscessed & started draining. I kept him in my bedroom 2 weeks until healed, the other cat will not leave him alone. We tried spraying with water, time out in a closed door room, time out in the cat cage, pheromone plug ins, everything we could find info on. The 'victim' is so afraid he hides in corners making things worse, he is so scared. One has to be locked in a room at all times when we are out of site. Please, if anyone can help I would be so grateful!