I haven't gotten my silkies yet but am wondering what can be used to prevent predators from digging under the small cage/coop? I want to be able to move it around like a chicken tractor, and it will be under a huge tree, near our house, in a neighborhood, inside a tall fence which is within a chain-link fence. I know there are raccoons, armadillos, a fox, and skunks in the area though. Do I need to attach something around the edges of the bottom of it? If so, what would be moveable but effective and not an eyesore?