Sometimes it does, although not anywhere nearly as often as it could. MOST males can be trained to ignore the presence of other males in close quarters while on leash. Handlers/owners also have the responsibility of keeping an eye on their dog's body language, and heading off problems before they occur.My question is about show dogs. There are multiple males in the rings at the same time. What about male on male aggression I have never seen it at any shows that I have attended so how does this not happen?