My new addition, Rupert, has motion sickness, too. The girls ride in booster seats in the back seat just fine so I was surprised when Rupert started drooling and throwing up while in his booster seat. I finally realized he was getting motion sickness, duh! Anyway, I took away the booster seat and put him in the front seat with a seat belt connector. After speaking with my holistic vet, I decided to put some lavender oil in the car around his riding area. She said it has calming properties. I think you can also put a dab behind their ears or on a bandanna/collar. I also bought some calming chews (two brands to try and both of them seem to work). I bought one from Ark Naturals and one from Vet Classics (also known as Natur Vet). The last two trips we took, one to the vet and one to do therapy dog work, he has done great. I hope some of these ideas help.
