Originally Posted by PaintHorseMares
And it's not pretty when it happens. Even when the trapped horse can escape relatively unharmed, it often winds up getting scraped/cut up by every rough spot on the walls/posts/etc during the escape. More room is always better. Our lead and boss mares take whatever spots they want, typically all the way in the shelter, and the others take whatever is left, but they never pick a spot where they could get trapped...and all our horses get along fine.
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I have experience on both sides of this. My mare IS the lead mare. Hands down, in every herd she's placed with. The exception was when we moved her the first time. It shot her confidence and she dropped to lowest of the pecking order. The BO went out one day and saw her, a monster 17 hand draft cross, pinned against the corner of the shelter and getting the CRAP kicked out of her with both hind hooves of one of the other horses.
When she moved again (BO rented a new barn) this flipped. She stepped up to the plate and she now rules with an iron hoof no matter where we move her (and she moves a lot with me). If another horse is in the shelter and SHE wants it, they leave when they see her coming.
If they didn't have a way out, I can see it getting nasty.