I have an older male (4 and a half) and a younger male (about 2 months). I had bonded them and all was fine. Recently they have been displaying a lot of dominant behavior. The younger pig does lots of mounting of the older pig. Both are teeth chattering and the younger pig is doing the yawning showing teeth thing. They will retreat to their pigloos but then they do this when they see each other again. There is also chasing around in a tight circle. HELP. I don't want to separate them too soon but don't want to leave them together when I go to bed in case they do each other serious damage. So far no actual bighting. Please advise if you can. Thank you