Country Brook Design Martingale with Deluxe Buckle - Dog's Life Collecton Collar fits (11in - 13in) 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: Boston Terrier, Dachshund, or Pug Made in U.S.A. Made of 100% patterned polyester Made with top quality hardware