Vehicles can be dangerous places for your pet if they aren't properly secured in place. One way to do it is with what I like to call "Puppy Car Seat." I purchased a Pet Car Seat over 6 years ago and I love it. In fact, it is the most awesome thing that I have ever purchased for my fur babies.
here - online. Take a look and I hope you will love yours as much as I love mine....great invention!
Oh, don't forget about a harness to go with your pet car seat. I use the Travelin' Dog Car Harness. It is made with heavy duty nylon and lambswool for added comfort. You can find it at Petsmart (in stores and online).
Happy and safe traveling everyone! :-)