The car strap is designed to work in conjunction with your harness to control your dog's movement within your car. While it cannot guarantee your dog will not be hurt in an accident, it will minimize the chance of them becoming a moving projectile or escaping if the car doors come open during an accident.
To avoid injury to your dog’s neck, do not attach to your dog’s collar -- only use this with a harness with a place to connect it to the back of the harness.
By attaching to the ring in the back strap of the Wonder Walker™ Body Halter© or your harness, the car strap helps to prevent pets from being injured during an accident. Easy to use. Just thread the seat belt through the loop, click it in place and then attach the snap to the ring on the back of your harness or Wonder Walker™ Body Halter©