The Instant Trainer Dog Leash is the safe, gentle and effective way to instantly transform any dog from unruly puller to perfect walker. Instant Trainer applies firm yet gentle resistance that tells your dog to stop pulling. Available in small and large to fit any size dog, and attaches to any collar. Just run it down the back, under the hips, through the loop, and you’re ready to go. There’s nothing else like the Instant Trainer Leash to keep your dog under control.