I'm wanting to add a dust bath for my girls in their run. Right now it's just hard packed dirt and we're working on adding some wood chips, etc to make some better covering in there. They've dug awful holes everywhere and when we add the new ground covering they won't be able to do that. So I want to offer them an alternative. I was thinking an old tire filled with...i don't know yet.. but it rains a lot here in Indiana so how do i keep it dry? what is best to use as the bath itself, bath materials, and how to keep dry? Thanks! 
