Choosing the right size dog boots for your puppy is simple: measure the widest part of the paw while your dog is standing. Size 1 fits paws 1.10 inches across and dogs 2.2-6.6 lb Size 2 fits 1.29 inches and 6.6-11.0 lb Size 3 fits 1.49 inches and 11.0-16.5 lb. The boots are made from soft, breathable fabric that keeps paws cool in summer and warm in winter. A textured rubber sole gives reliable grip on hot pavement, icy sidewalks, sharp stones, broken glass, snow, rain and slippery indoor floors. Two wide reflective straps adjust in seconds, stay secure on walks and make your dog visible after dark. The boots also protect hardwood floors, car seats and visitors from scratches, reduce licking and chewing of wounds, and keep injured paws clean during healing. Lightweight and flexible, they let dogs run naturally while looking like the charming superstars they already are.