Two stray Bulgarian cats who lost their hind legs in accidents have been given bionic paws, in what vets say is the first operation of its kind in Europe, excluding Britain. Pooh, the one-year-old feline whose name means "fluff" in Bulgarian, scurries around Sofia's Central Vet Clinic, chasing a toy mouse and curiously sniffing at medicine bottles inside an open cupboard -- just like any other cat would. The only difference is a gentle tapping sound as his two tiny polymer-and-rubber paws mounted on titanium stems touch the floor. Pooh is thought to have lost his legs in a car or train accident last April, but is back on the prowl thanks to Bulgarian veterinary surgeon Vladislav Zlatinov.