The Jorgensen Halti Head Collar simplifies training, while correcting misbehaviors by guiding the dog's head so the body will follow. It calms and allows the dog freedom to pant. It features a quick release buckle on an adjustable collar, noseband positioned away from the eyes for an unobtrusive fit. Lead ring and fixed angle for a secure and comfortable fit. Training instructions are included. Dr. Roger Mugford developed the "Halti" over 27 years ago in the UK. His creative design was the first to address the idea of a head collar for dogs. His concept has been used by over 1 million canine owners worldwide. Sizing Chart Size 0: Fits most Toy Poodles, Yorkies, Papillion and other toy breeds. Size 1: Fits most Jack Russells, Daschunds, Westies, etc. Size 2: Fits most Beagles, Cocker Spaniels, Schnauzers, etc. Size 3: Fits most Boxers, Labs, Shepards, Setters, etc. Size 4: Fits most Rottweilers, Mastiffs, Newfoundlands. Size 5: Fits most St Bernards, Great Danes, Bloodhounds, etc.