DO NOT USE WITH A COLLAR, ONLY A HARNESS!Sometimes the smallest tool makes the biggest difference. The Direct to Seatbelt Tether attaches to the female end of your seatbelt, and can just live there. When your dog hops in, simply attach the opposite end to his harness via the included carabiner, and off you go—your dog safely in back, and you in the driver’s seat (even if your dog wishes it was the other way around). Tether extended from 15" to 22" for a broader range of movementAll steel hardwareUniversal fit for most vehiclesIncompatible with Volvo. Not recommended for Ford F-Series trucksDesigned to prevent distracted driving. Not crash tested