The PetSafe? Happy Ride Seat Belt Tether lets you safely secure your active dog in the backseat so you and your best friend can enjoy being on the go together. The seat belt tether works with your pup's Happy Ride Safety Harness and adjusts to let you customize his range of mobility in the car. The durable nylon tether and carabiner are simple to set up and will help keep any size furry family member safe while traveling. The PetSafe? Happy Ride Seat Belt Tether is just one of the ways we help you and your pet live happy together.