I prefer the booster seat over the kind that hook over the headrests. We have a Snoozer booster seat. It buckles into the car, and the pup is harnessed into the seat. Elevated so they can see out the window, and super cozy so they can curl up and nap.
We travel a lot, so Levi has become very accustomed to his car seat. I put it in my back passenger seat so he can easily look at me and supervise my driving.
Here's a photo of my crazy man taking it easy in his seat:
http://www.yorkietalk.com/forums/alb...ctureid=108727