Riddick use to get sick all the time when I'd keep him in his crate. And if he couldn't look outside.. I use to give him a little bit of Pepto Bismol about a half hour before going in the vehicle. It worked like a charm. You can get some stuff from WalMart that is just for that also..
Riddick no longer gets sick in the vehicle.. He loves going for rides.. If I can find the name of the stuff from Walmart that I bought and never used, I'll let you know.. I remember it saying "Calm" on the box.. But that is all I remember at the moment!!