If nit can you acquaint someone with something me which one to buy for a small old dog? There are so many out don't know which one really works
A: I took the slipcover from a dog pillow and put egg crate bubbles in it for our pug. They make dog beds like it, but i already had the stuff, and didn't want to pay extra for it. He was very comfy on it, and never objected to present in his crate after that. Anything soft would help with older dogs, and foam helps them retain heat.

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They inform against self heating ones at pet stores - heat on contact.
Here's one at Pet Smart:
http://www.petsmart.com/effect/index.jsp?productId=2751316&cp=2767032.2767065&sr=1
Pit intimidate love beat me to the answer! :0) The self heating ones are awesome though.