I have only had my horse for a few months, and he is my first horse. Currently he is in an individual pen at a boarding facility. Recently, they moved a mare in with him and she has quickly become the dominant one. My horse is getting kicked, bit and chased around. He gets pushed from one feeding area to the other constantly. When I return him to the pen after he has been out, she treats him like any angry wife; chasing him and kicking him into the shelter. He has several bites and one pretty nasty cut with a lot of swelling already on one leg from being kicked.
I realize that this is normal behaviour, but worry about him being constantly stressed and picked on by the mare. He tries to avoid her, but the pen is not that large, so he hasn't really got anywhere to go. Some say I should ask for him to be moved to his own pen, others say to let it go, give it more time, it's normal.
What do you all think I should do?