In some states its the law! Compatible with any buckle this Dog Seatbelt for dogs (30-200lbs) clips into the seatbelt of your car, and attaches to your dogs harness. Adjustable from 1.5-3FT;this will insure your dog will have plenty of room. In the back seat, if adjusted to 3ft your dog will have enough room to go window to window, but not be able to come up to the front. WHY USE A DOG SEATBELT? 1) Your dog never becomes a projectile 2) When the car door opens, your dog can’t jump out into traffic 3) Your dog can’t jump out the window 4) Your dog can’t sit on your lap (it’s illegal). Purchase your dog seatbelt today!