Car pet harnesses are usually far too constricting not even allowing your dog to lie down comfortably zip line is a brilliant new idea from the usa that keeps pets restrained and safe yet allows them to move around on your back seat the line simply attaches between the two rear passenger side handles or between the rear seat belts which automatically lock when pulled to create a tether run so your dog is free to roam safely and you can drive without distraction comes complete with matc