The Beaphar Gentle Leader is a unique patented design that has been scientifically developed to work with your dog's natural instincts in order to control unwanted pulling on the lead. The Beaphar Gentle Leader provides kind and effective leadership and makes training at home quick simple and fun for both you and your dog.A dog's natural instinct is to pull on the lead. The Beaphar Gentle Leader helps to counter this in three ways:1. Gentle pressure is transferred to the back of the neck naturally stimulating a relaxation response (the same as when a mother carries a puppy by the scruff of its neck).2. Gentle pressure is applied around the muzzle from the nose loop communicating your reassuring control.3. It works like a halter rope – where the nose goes the body will follow.KEY FEATURES: Easy-to-fit and adjust. Adjustable sliding clamp – to reduce or increase the size of the nose loop. Buckle – forms part of the neck strap connects either end as you would a collar. Centre double D-ring – enables the nose loop to apply pressure as your dog pulls and instantly release when they stop. Enables dogs to be trained to be sociable and obedient calmly quickly and effectively. Even whilst wearing a Beaphar Gentle Leader dogs can still eat drink bark pant etc. Can easily be converted into an ordinary collar simply by using the neck strap as you would an ordinary collar and using the nose loop as an extension of the lead. Endorsed by leading animal behavourists Designed by veterinary surgeon Professor Robert Anderson Director of the Animal Behaviour Clinic at the University of Minnesota USA and Ruth Foster former President of the American National Association of Dog Obedience Instructors. Dimensions:Noseband Diameter: up to 36cmCollar Size: up to 56cmTypical Breed: Labrador Cocker & Springer Spaniels German Shepherd Boxer Retriever Dobermann