ACE would try to attack for his food, so we took it from him and gave it
Rocky. We make ACE sit and stay until we noticed that
Rocky was ready to walk away and let ACE approach. On that note, we would then tell ACE he was allowed to approach, but when Rocky wanted to approach again, we forced ACE to back down.
Sooner or later ACE and Rocky basically learned their places that we gave to them that way they didn't have to fight to the death for dominance.