I have no idea. I've never had a cat that was vicious, just overly enthusiastic, shall we say. I'm sure someone on PT can help you w/that issue. Personally, I wouldn't tolerate that behavior but everyone has different levels of tolerance. I keep a water squirt gun nearby in case one of my fur posse decides to become obnoxious. S/he gets it right in the face and that usually stops it. If not, s/he gets banished in exile until s/he learns how to behave.