In her review of Frosty Dog, Chantal Ritz says that she doesn't think that any dog toy is "truly 'indestructable.'" I agree. There's not a dog toy made that can withstand the chewing of a particularly determined mutt. So the only really fair tests for a dog toy are whether your dog likes it; whether it's safe; and whether it holds up reasonably well when subjected to day-to-day gnawing? With those tests in mind, the "Dynamic Duo," (a male Westie and female Scotty) give Frosty Dog four stars. They are currently trying to dismember their second. The first one lasted a year, the last six months of which were spent with two legs and no nose. And they would still be playing with it, except that I got tired of looking at the poor bedraggled thing. By the way, I think that the "large" FD is probably the right size for all, but the very smallest, dogs. The Dynamic Duo only weigh in at 20 pounds each, but the "large" FD suits them fine.