I make pet pads with corduroy one side and tshirt knit or flannel on the other side. I had lots of this left from my clothes sewing days and I sometimes pick some up at yard/estate sales. I use cut up mattress pads, old towels or blankets for the batting. I give these to the rescue organizations that are in the pet stores or any other rescue or non profit animal groups.
I also collect towels when I go to yard/estate sales to give to the shelters and my vet office as these are used quite often by them. It is just one way to give back and help out the local animal organizations.