blank Small Size - For dogs less than 22lbs; Lead - Length: 4FT, Diameter: 1/4 inch; Collar - Width: 0.6 inch, Neck Girth: 9.8-13.8 inch Medium Size - For dogs between 22-44lbskg; Lead - Length: 4FT, Diameter: 3/8 inch; Collar - Width: 0.8 inch, Neck Girth: 13.8-20.8 inch Large Size - For dogs between 44-66lbs; Leash - Length: 4FT, Diameter: 1/2 inch; Collar: Width: 1 inch, Neck Girth: 20.8-26.8 inch