I have 3 pygmy goats that are taking up a badly needed stall in my barn. I want to put another smaller shelter out behind the barn for them - I'm thinking one of those small barns meant for storage. I want to give them the ability to go in and out as desired, but don't want to just prop the door open and let all the snow blow in! If I cut a small opening and put a flap over it, would they use it or be afraid of it? This might be a silly question, but I've never owned goats before. Thanks.