Generally used to teach a dog not to jump, the harness lead will tighten around the dogs body or chest area when he pulls or jumps up. The manufacture claims that this action helps to alleviate pressure on the trachea. Less pressure on the trachea is a great idea, but be sure to read all of the information on the manufacturers website to avoid injury or misuse. Unfortunately, as a traditional harness will put pressure directly on the dogs chest area, it may actually