Inspired by a dog run, the Auto Zip Line restrains your dog in the back seat for safe driving, but allows back-and-forth plus sit-and-stand movement. It can be strung between any two fixed points in a vehicle, on a boat, or at your campsite. It includes a detachable leash that easily connects and disconnects from the zip line, which means you have an instant lead to keep Fido from jumping out of the car into oncoming traffic or a congested parking lot.