First of all, the Gentle Leader headcollar is NOT a muzzle. When fitted properly, your dog is free to open his mouth to eat, drink, pant, fetch, bark and even bite - except when you close his mouth by pulling on the leash. The Gentle Leader headcollar features two soft nylon straps - the collar portion fits high at the top of the neck, and the nose loop fits loosely and comfortably across the base of the muzzle. Each strap has a distinct and important effect.
Choosing the correct size of the Gentle Leader Headcollar for your dog is simple. All you need to know is the approximate weight of your dog. The only exception is that certain breeds with specifically large or small heads may use a size other than what is listed for body weight. Please note - all sizes are adjustable to fit a variety of breeds in the specified weight range.
Small - Fits dogs and puppies that will have an adult weight of 5-10Kgs. Includes toy breeds and small dogs with a narrow, small muzzle. Examples: Toy Poodle, Lhasa Apso, Dachshund, Bichon, small Sheltie, Pomeranian, Shih-Tzu, Basenji, Fox Terriers, Jack Russels, Beagles etc.
Medium - Fits dogs and puppies that will have an adult weight of 10-27 Kgs. Also includes small dogs with a broad muzzle. Examples: Cocker, Spinger, Brittany, Collie, Beagle, Airedale, Australian Shepherd, Samoyed, Norwegian Elkhound, Kelpies, Pointers, Blue Heelers, etc.
Large - Fits larger dogs that will have an adult weight of more than 30Kgs, and some dogs under 30 Kgs with larger heads. Examples: Basset, Golden, Lab, German Shepherd, Doberman, Sharpei, Rottweiler, Mastiffa, Old English Sheepdog, Malamute, Akita, Great Dane, etc.
For Puppies - Puppies of medium and large breeds can start at 8 to 10 weeks with a medium which they can wear until they reach 30 Kgs. Puppies of large breeds that are already over 20 Kgs should start with a large.
PLEASE NOTE: Suggested breeds are for examples only and based on average size for that breed.