My pit loves to chase our kitty, but we have a bengal and he loves to be chased! It doesn’t sound like your cat likes to be chased. Does he nip at your kitty while trying to chase? My pup definitely does. As long as your cat is not egging on your dog then that makes it easier. I’ve filled up a bottle of vinegar and water and sprayed my dog every time she ran after him or tried to play, and I stayed consistant and she stopped! Which I praised her for, a lot, a lot of praise for not chasing. I eventually stopped with the spray bottle and now she’s back to chasing him again but I let them play because my cat asks for it. But she tries to bite him when she chases, so I had to let my cat stand up for himself. He has whacked her a couple times and she stopped chasing him because she didn’t understand why it hurt, haha! If your cat doesn’t stand up for himself then you will probably continue to have a problem. Your best bet is to get a shock collar. Or have your dog sit and wait while your cat does whatever it does. Definitely make sure your cat has an escape route at all times.