My two neutered male cats romp, wrestle and chase each other through the house every couple of days. About the worst seems to be an occasional scratch on the neck area even though I'm good about keeping their nails trimmed. Is this just boys being boys, or is it aggression I need to monitor somehow? One is around 12, the other maybe 7. The younger cries piteously if he's on the receiving end, but it feels like that's all an act. My 12ish female cat does not participate, and sometimes charges at the younger male, who runs off someplace. I share the cats with another person, so the combo of who's here and who's away changes. (Don't ask. It's too weird, but it's a fact.)