Heavy Rug or Dog Bed - Materials That Won't Draw Moisture?

Go to the hardware store, Home Depot or something of that nature and get the interlocking heavy foam tiles and put the beds on top of them. We do that in our basement because we only have a thin rug down. The crates rest on the tiles instead of the floor. They aren't that expensive and you can undo them for easy storage/transport. It will keep the coldness from getting to the bottom of the bed.