I have both the Snoozer lookout II and the Solvit Tagalong Deluxe Booster Seat. I love them both. I use the Snoozer going on long trips or driving a lot. I use the Solvit for times I need to put him in the car quick. I leave it in my truck. It lays flat.
Snoozer Lookout II Pet Car Seat - Black Tagalong™ Deluxe Booster Dog Seat