Has anyone invented a cooling pad for dogs to lay on like the orthopedic cold therapy machines?

We have a Donjoy http://www.dme-direct.com/donjoy-iceman-ice-man-cold-therapy-cryotherapy-1100-don-joy/ cooling pad that connects to an ice chest via water hoses that circulates the cold water to reduce swelling. Thought it would be a neat idea to make a large enough pad do allow a dog to chill on. In the summer they hate to lay on carpet but prefer tile floors, I assume because it’s cooler. Maybe people would like it too. I know my dogs would be claiming something like that if it was here.