PUPTECK Small Puppy Walking Harness and Leash Set for Tiny to Medium Dogs Size S: Chest girth:12.5"-18.7", Neck girth: 14.8", Leash size: 4/5"*3.9FT (120cm). Fit for 5-10 pounds. Material:The breathable air-mesh fabric can keep your dog cool and dry in the summer, is soft to touch. Safety:Plastic clip closure and two heavy duty D-rings for added security,quick release,easy put on and take off. Visible:Reflective band make your pet can be seen at night,add the security when your dog walk. Size details have been updated,according to the measurement issues we have got from the former buyers' suggestions and reviews. And you can choose the size by the weight of your puppy now.If any problem, just contact us. Data revised on March 20th, 2017 Size S: Chest girth: 10.5&#034;-14.8&#034;, Neck girth: 12.48&#034;, Leash size: 1/2&#034;*3.9FT (120cm). Size M: Chest girth: 12.5&#034;-18.7&#034;, Neck girth: 14.8&#034;, Leash size: 4/5&#034;*3.9FT (120cm). Size L: Chest girth: 16&#034;-25&#034;, Neck girth: 17&#034;, Leash size: 1&#034;*3.9FT (120cm).