A dog that's jumping all over the car's back and front seats can easily distract you from driving.
So manage your dog's behavior this way: put this harness around your dog, then clip its adjustable leash/tether onto the "zip line" you run above the length of the back seat (line secures to the grab bars above both doors). He'll appreciate the flexibility of almost-free reign of the back seat; you'll appreciate the minimized distractions. Harness can also be used with just a seat belt.
Please specify size: Small (dogs up to 25 lbs.), Medium (up to 50 lbs.) or Large (up to 80 lbs.).