I always buy these boots from Canine Concepts as my greyhound gets corns on her front paws. The lovely greyhound vet pares her corns for her and I use the boots to cushion her feet and slow down the corn growth. She is so used to wearing them she actually runs better with them on. They are getting quite expensive but if they wear out unevenly you can put them on opposite paws, they are not really 'left and right' specific. So thanks to Canine Concepts for stocking these little boots and the insoles - extra padding. Great service - I've never had a problem. Am happy to recommend Canine Concepts.