I have 4 males and 1 female. All were neutered and spayed within the last 2 months. They range in age from 7 mos. to 3 yrs. I waited too long to neuter! They all know JPop is dominate, but the 11 mo. old, TJ, picks fights with our newest stray, Radar, who is about 9 mos. Radar is very mild, layed back, and knows his place is pretty much the bottom of the pole. But TJ is so mean to him! He latches on to his tail, hubby says TJ is jealous because he doesn't have one, or his ears and just holds on while poor radar is screaming!
DH has twice had to pry his jaws open to get him to let go. I really don't know how to handle this situation, and have given thought to rehoming TJ. But, I know I can't do that; he snuggles up to me every night under the covers. But I can't have him being so mean to Radar either. Radar is the only one he picks on. If anyone has advice for me, I'm all ears.
Good luck in your decision. My only advise is, as someone else said, neuter early.