We have a Solvit Pet booster seat. At first I thought I liked it. But after using it I noticed Bobby would not sit down in the seat. He would put his paws on the front of it. And if I breaked too hard or sudden he would fall out and hang there!
So I bought a new seat from pet gear and I love it. He sits on the seat and can still look out the window. Here is a link to it.
Pet Gear Booster Car Seat at PETCO