ThunderLeash No-Pull Dog Leash This simple no-pull" leash solution has proven effective with over 80% of dogs. Recommended by positive-based trainers around the country. With consistent, safe, gentle feedback, ThunderLeash encourages your dog to stop pulling. Goes on in seconds with no complicated straps or irritating head-collars: Just clip it to the collar, wrap it around the torso and go. Comes with easy-to-grasp, comfortable padded handle. Take less with you: This 2-in-1 solution can be used as a harness, or just as a leash. Adjusts to fit any breed of dog. ThunderLeash is an effective, drug-free training leash. Also works with ThunderShirt.