I missed the doggie seatbelt thing (duh - my mind was on other things!!). We have a doggie car seat for our bichon. It's a nice one - there's a "suitcase" at the bottom for his things, then the raised, padded seat with a halter for him.
The last long distance trip he went on (to Tennessee - this pup travels!), I got stopped for speeding. The trooper laughed at the little sign on his car window (Warning - this car protected by a killer bichon!), and asked if he was restrained. When I showed him the halter, he lowered my speed
forty miles mph so I only had to pay the minimum fine, and it wouldn't show up on my insurance. He also said that he did it because our dog was properly restrained! So, even if you think it looks silly, the doggie seat belt can save your dog's life AND help you with a ticket!