I'd heard about gingersnaps. I have different opinions...I gave it to mine and they did not get sick-cannot say if it was from the cookies or not. Then I gave it to Maggie May and she threw up the cookies along with whatever else.
The snoozer car seat seem to help quite a bit. They can look out while moving. As with humans, your eye can focus so I really think it makes a big difference for them to sitting up higher. It seems as though when Maggie started looking out did her car sickness subside. She was definitely a barfer when it came to motion. She got sick in the car as well as on the boat. She's fine now after 1 1/2 years.