I can't believe there are seat belts for pets. You people are way too paranoid! I'd just let my dog, if I have one, ride in the back of my pickup truck (lorry for the Auzzies and Brits).
I would like to comment on that for those who don't care about their pets.
A couple of years ago I was passed by some idiot in a pickup truck while going around a dangerous bend.... I didn't even speak, but just shook my head as he passed me. At the next straight stretch, he slammed on the brakes and the pup in the back went flying out of the truck and I will never forget the image embedded in my mind.
We swerved around him and called the OPP immediately, but never heard whether he was caught or not.
When I was a kid, my friend's dad had an El Camino, which was a hybrid car-truck. We used to ride in the back of his El Camino from school a lot. I don't know why people are such wussy now a days. Now a days, my friend's dad would probably get pulled over and arrested for being a bad parent. Why can't they just let people live their lifes like the old days. People are way too paranoid now. My brother-in-law would refuse to buy a car with less than 6 airbags! If people want to take some chances by living life to the fullest, let 'em. Besides, the number of such accidents is probably really small compared to other accidents, like getting hit by a car. Heck, maybe we should ban cars, so no dogs would get hit.