Mine did chew one of the towels, but only until they could get underneath it. To prevent further chewing, I just leave a little bit of room in one of the corners for them to get underneath if they want to hang out under there. No more chewing! The towels I use for them don't really have the loop things most towels have. I got them at a garage sale for $.10 each, and they're really soft and nice. (Garage sales are wonderful places to find rattie stuff for even cheaper than dollar/thrift stores!)