Our resident male cat, Sultan, has been chasing our newer cat, Swee'Pea (female) a lot and swiping at her fur. She runs from him but doesn't chase him back -- how can we know if Sultan is being playful or is he being aggressive towards her? It's clear that he's establishing dominance. He's about 4-1/2 years old and she's about 10 years old. He's been neutered and she's been spayed. We've tried scolding Sultan but of course that didn't do anything. Once in a while she'll shriek but most of the time she doesn't make any sounds. We think she seems to be alright otherwise. At night they sleep on opposite ends of the couch. Is this behavior something we should be concerned about or should we just leave them alone?