The Beaphar Gentle dog lead is an motivational aid for the management of training your dog. Featuring a unique triple action, the Gentle Leaders design counters the instinct to pull by, 1) Gentle pressure is transferred to the back of the neck, naturally stimulating a relaxation response, 2) Gentle pressure around the muzzle of the nose loop naturally gives a relaxation response, 3) The lead works in a similar to a halter on a horse – the body follows the nose. Available in three sizes Large, Medium and Small which is suitable for puppies. Read more…Size Guide:Small size: Westie, Yorkie, Jack Russell, Toy Poodle, Lhasa Apso. Also suitable for Medium/ Large Puppies. Medium size: Labrador, Cocker & Springer, Spaniels, German Shepherd, Boxer, Retriever, Dobermann, Staffordshire Bull Terrier. Large size: Large German Shepherd, Large Labrador, Rottweiler, Great Dane, Newfoundland. Bitches and young dogs may need a size smaller.