Instant Trainer Leash uses gentle but firm resistance to discourage your dog from pulling. It attaches to any collar to give you complete control! Don t dread walk time any more, instead have complete control over your dog, or walk multiple dogs. This perfect leash teaches your big dog to be a great walker for anyone! That s why it s veterinarian and trainer approved. Instantly trains to stops pulling The gentle way to train any dog to be a perfect walker ATTACHES TO ANY COLLAR NO CHOKING WORKS ON ALL DOG 6FT. LEASH