Lupine 1 Inch No Pull Harness for Medium to Large Dogs Simple and effective tool to help you teach your dog polite leash-walking behavior Works with any non-choker style collar and a leash Gently redirects the pulling dog; by praising/rewarding when he stops pulling, you show him that not pulling is much more rewarding than pulling Watch the video online to see a demonstration of the technique Guaranteed (Even if Chewed.) and proudly built in New Hampshire since 1990