Country Brook Design | Sugar Skulls Ribbon Martingale with Deluxe Buckle Collar Collar fits (15in - 21in) neck. There are no standard sizes for dog collars. Please be sure to measure your dog's neck for correct size. Measure around your dog's neck (with string or tape measure) snugly where you want the collar to lay. If you have any questions or problems with sizes please give us a call before ordering. Breed Recommendation: Greyhound, French Bulldog, or Collie Made in U.S.A. Made with a YKK side release buckle Polyester grosgrain ribbon sewn atop 100% Nylon