I was wondering if anyone had any ideas for a small portable dust bath. I have a small coop and yard but sometimes they have to stay in the coop or it is raining and the ground is muddy. Also, would I fill it with sand or dirt? You can see pictures of my coop on the "Chickens & Gardens blog" part of my website www.workdychickenpictures.com so you can get some idea of what I am dealing with. It is about 5.5 feet square so whatever I make for them can't be too big. Also is there a way to keep them from pooping in it? If anyone has experience with this I would love to hear.