Size: Size1: (1.5''x1.1'')(L*W) for 2-4lbs. Size2: 1.7''x1.3'')(L*W) for 4-7lbs. Size3: 1.8''x1.4'')(L*W) for 7-12lbs. Size4: (1.9''x1.5'')(L*W) for 12-16lbs. Size5: (2.2''x1.7'')(L*W) for 16-21bs. Great for Small Puppy like Samoyed, Poodle, Husky, Chow Chow etc. Please refer to the picture size chart, you can choose the right size for your dog for the most comfortable fit. Professional: High quality fabrics, breathable mesh design, keeps dogs paws cool and away from disease. Soft OX tendon sole with shock absorber provides stability and makes walking, running and hiking comfortable. Comfortable: Soft and breathable to paws, allows the boots to be used indoors and outdoors, hot and dry conditions, prevent from sharp thorns and hot pavement. Effectively protect dog claws from heat, stones, glass, etc. And thickened sole makes sure paws wont get wet even dog steps into a puddle carefully. Safe and Adjustable: Easy to put on / off ,the dog shoes are fastened firmly by 2 straps for small & Medium size, which are long and adjustable, capable of preventing from slipping off and supplying a customized tightness for secure closure. Please try to tighten the straps after wearing, which can effectively prevent the shoes from falling off the dog's claws.