Size Information : This dog harness contains 3 sizes, suitable for small, medium, large dogs. SMALL chest size: 14.8"-21", collar size: 7.5"-10.2", strap width: 1/2" ; MEDIUM chest size: 17.3"-23.4", collar size: 12"-16", strap width: 3/4" ; LARGE chest size: 23.4"-31", collar size: 14"-20", strap width: 1" ; LEASH size: 5FT.(Please measure the size of your pet before buying and choose the correct size for purchase) Size: S. Color: Purple.