SparklyPets Hands-Free Dog Lead for Medium and Large Dogs – Professional Harness with Reflective Stitches for Training, Walking, Jogging and Running Your Pet (Green Range, For 1 Dog)Security clips on the belt Unlike other running lead for dogs which can have your dog break free as a result of the belt unlatching, our professional dog running belt has a support mechanism that is designed with 2 stainless steel clasps that take all the tension off the plastic buckle and divide the pulling force to both sides of the belt! Made for medium and large dogs If you have a large dog, you need a leash that absorbs shocks and allows you to