I would say the carpet on the the back of the door would work. At a yard where i used to be they put a metal pole at the back of the door just far enough away from the door so the horse couldn't kick it when she was stabled, or when the pole was on the door could be left open.
im looking to buy some of the large bales of straw and haylege for my horse as the little bales are costing me too much. Just wondered if anyone could suggest anywhere? I live in chesterfield, derbyshire.
Thanks for your help.