If your dog is well past the chewing stage.......before my dog Stitches had ACL repair, I took a piece of the egg crate foam twin mattress topper and doubled it over. I then took polar fleece and sewed an "envelope" of sorts, with the flap on the side. I closed the flap with velcro, making it relatively easy to remove the cover for frequent washing. He loved it , it was comfortable on his joints, and it wore well.