Randi ~ Here you go.

We have several that we ordered from Amazon.com They are made of a hard plastic with a gel inside that you heat in the microwave. You can put it under a towel or blanket for your cats/dogs to lie on or buy one of the covers they make. Ours won't lie on the hard plastic without a cover -- maybe because it's too hot at first.



Read the directions carefully as you may have a more powerful microwave. We heat ours for 5 minutes and it stays warm all night.

http://www.amazon.com/Pet-Supply-Imp...ggle+safe+disc