Joel Silverman Patented Alternative Training Collar (Medium)

XXS - 3 to 6 lbs toy breeds XS - Larger Toy Breeds, Large Chihuahua, Small Jack Russell Terrier, Llaso Apso, Maltese, Min. Pins Small: larger Jack Russell Terrier, Westies, Small Terrier, Bichon Frise, Havanese Small 1 - Pug, Smaller French Bulldogs Medium - Bigger French Bulldogs, Smaller Aussies, Smaller Border Collies, Shelties Size M 1: Bigger Aussies, Border Collies, Boxers, Weimarainers, Smaller Golden Retrievers and Labs Size M 2: German Shepherd, Golden Retriever and Labrador Retriever Large Shepherds, Large Golden Retrievers and Large Labrador Retrievers Size XL: Large Mastiffs, Saint Bernard (most dogs with very large head over 45 kg)