I have the same problem with Buddy, he pants, licks, and trembles in the car...we've tried everything thinking it was a training issue. He loves to be in the car when it's not moving, but once it's moving he turns into this trembling panting pup! I might give the drops a try too. I'm ready to do just about anything to give him less stress...and too, after we are done with the ride/travel, he doesn't eat normally for a few days. DO you think the motion sickness (without vomitting) could keep his tummy so upset?