we've got one of these gel pedic orthopedic beds. its not a thermo bed, but it helps hips and joint problem by relieving pressure. my girls love it.
"The Gel-Pedic® orthopedic pet bed combines a natural nesting shape and a new patented material called GelFoam®. GelFoam® is a heat sensitive memory foam type material that custom forms to pets’ bodies, easing pressure on legs and hips. The gel helps keep pets cool in the summer by maintaining a lower ambient temperature, while the foam helps keep pets warm in the winter with dense insulation."
Orthopedic Dog Beds made with gel foam - Luxury Memory Foam Pet Beds for Small, Medium & Large Pets