My cat Chester has a special ball all his own. When he is playing with, he will not let anyone near him. He has to be in a room all by himself to be completely content, and if you are in the room, he will lay on top of the ball and let out this low pitched growling type sound. Don't even try taking it away from him, because he will bat at you and probably give you a pretty nice gash on your hand! I'm glad he has something he is so passionate about, just too bad none of us can share in the fun right along with him.
Chester & Abby's Mom