How long does it take for the male hormone levels to settle down after neutering. Ben ( 9 months old) was done at the end of December but he seems to be getting more feisty by he day. He is constantly wrestling with the two other older cats, both male. They are twice his size and weight but he won't back down - he's quite fearless! I'm just letting them get on with it as long as no-one is getting hurt but it sounds terrible at times! I suspect that he is just getting into his stride and world dominance can't be far off!