My shihtzu gets car sick every time we take him for a ride, even just short 15min trips I thought maybe this would cure itself if we kept at it little rides here and there but it never fails every time he vomits in the car. I was thinking about trying a gravol next time before we go but will this make him drowsy,or will it help? I can't keep him out of the car unfortunately he needs to go to the groomers.