i have a 10yr old gelding OTT and recently he has become very aggressive with other horses. He has alway been kind of obnoxious. He is definitely the dominant horse personality. I have struggled with earning his respect for me and recently after several months the 2 of us have clicked and now have mutual respect. Problem is now that he is great whenever I work with him and outside the stall, he has slowly become more aggressive inside the stall toward other horses. Feeding time has led to many of fights with the horses beside him, so much so that a couple of the horses have become injured from kicking the metal wall. The facility that he is being boarded at is now asking me to move him to a new facility for concern over his aggression. Help, I don't know how to fix this problem.