I have a 13 - 14 y.o. male tabby who's really laid back, and a 6 y.o. female who has always ruled the roost. They are affectionate with each other - groom each other, sometimes play together...they've been together since the 6 y.o. was 6 months old. The problem is that the younger cat has a bit of a mean streak and sometimes likes to torment the older cat. She does "sneak attacks" or chases him around. I hate to see him so persecuted. He can get away from her by jumping up on a little half wall, but he usually just runs to another room. I yell at her, and then both cats scatter. Surely there's a better way. I play with her a lot and she gets plenty of exercise, but when she gets on a tear, there doesn't seem to be anything that will stop her. Any ideas?