I built an 8x8 pen outside under my back deck. It has a roof and it is mostly weather proof, but I'm wondering what to use on the floor. It is a hard wood floor, that I don't think would be very comfortable. I also don't want to use loose bedding unless I have to (really messy and expensive). Tl;dr On a hard wooden floor, do I need to put a different type of floor, if so, what?