Gentle Leader - Medium - Black Helps train your dog to STOP pulling on the lead Dogs of all sizes pull on collars and harnesses due to a natural instinct to pull against pressure. The Gentle Leader’s unique triple action, patented design counters that instinct in 3 ways:- 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. It works like a halter on a horse – where the nose goes the body will follow Medium size headcollar suitable for Labrador, Cocker & Springer Spaniels, German Shepherd, Boxer, Retriever, Dobermann and Staffordshire Bull Terrier Available in red or black