San2
Mod
I used to have a rottweiler, 180 lbs of pure muscle. When we got him, I got an estate car and what they called a 'dog net'. Basically just a sturdy net that was put behind the second row of seats, and the dog would be in the back. It left him room to move - those dog seatbelts were just too cramped, and he barely fit into the back row anyway - but if there had been a crash, the net would have stopped him from hurting himself, and from flying into the front and probably killing somebody there.