Why tether your dog? It limits the movement of your dog to help avoid driver distraction, and it helps in protecting you dog in sudden stops, starts, and mild collisions. It also keeps your dog from becoming a dangerous missile that could injure other vehicle occupants in adverse situations. For your pet's safety always attach tethers to an appropriate strength harness, rather than his collar, and use two tethers for dogs over 100 lbs.
The Picture to the left shows the Kwik Connect Tether connected to the dog seat belt harness.