I am also experiencing this with Wallee. I have a harness that buckles into the seat belt for safety and try taking him out on short trips. He gets excited when I say "do you want to go in the car" but as soon as we get moving he starts shaking and whining. He has been sick a couple times on longer trips but even on short ones, he gets so stressed out. I am hoping to keep trying to take him out almost daily and praying that he will eventually get used to the car.