Others have said these are a game-changer for our dogs and they really are! Our dog runs in the 1.25 (back) and 1.5 inch (front) Hi and Light trail shoes. They prevent his feet from getting sores on the pads when running on concrete or rocks on the trail. Ruffwear gives excellent tips for breaking in the shoes and training your dog to wear them. We started slow by having him wear them for <5 min in the house for about a week to do tricks and get a bunch of treats. Then we worked up to taking him on a short walk, and eventually made the walk longer and longer until we started to run. He was too distracted by everything else on the walk to worry about his feet. The front shoes were a bit stiff, so we washed them with some tennis balls, and that helped work the rubber. We highly recommend the dog socks with the boots. They made a massive difference in wicking away moisture and preventing the boots from creating any wear spots. I'm convinced that shoes like these are essential for every dog that travels or traverses hot, hard, or hazardous terrain (such as snow and ice melt or weed killer sprayed on sidewalks). Five stars, Ruffwear!