Gentle Leader Quick Release Black Extra Large Above 130 Lbs. The #1 recommended headcollar endorsed by leading professionals, behaviorists, veterinarians, and obedience instructors. Strongly recommended for first time users because it has the in-depth training DVD. Soft-but-strong nylon provides maximum comfort and a reliable fit. Stop problem behavior like pulling, jumping and barking. Also teaches you how to train your dog to sit, stay, down and come.