I AGREE WITH PEEKAWHO. I HAD A POODLE WHO ALSO GOT CAR SICK. MY VET SAID TO GIVE HER DRAMAMINE OR BENADRYL OR BONINE. THE CHILDS DOSAGE OF BENADRLY AND DRAMAMINE WORKED GREAT FOR HER! IT ALSO HELPS THEM TO RELAX. MINE GOT DROWSY WHICH WAS GOOD SINCE SHE ALSO GOT ANXIOUS DURING THE RIDE. I, TOO, GET CAR SICK AND THAT'S THE WORST FEELING!!!!!! PLEASE TRY ONE OF THESE. I HAVE ALOT OF SYMPATHY FOR YOUR DOG. GOOD LUCK.
TERRIEMAE
You'd have to ask this question of a vet. I know they can take Dramamine for car sickness, and even Benadryl (which surprisingly works on our dogs better than Dramamine).
Zofran, I don't know if that's safe for dogs.