What do you put on the bottome of the crate? I'm concerned with wash-ability, durable to withstand a puppy possibly chewing on it and yet be comfortable for a puppy. I've seen pretty expensive lambs wool looking crate fitting beds of sorts that have a cushion type bumper border going around it. Not sure if a towel or blanket is good. I thought of a bathroom type of rug, but then thought the puppy would chew on the shaggy material fibers and since it's probably imported from China, not a safe idea. Perhaps a thicker towel-type material bath mat would work? It might hold up better.