I would go to either Pets Mart or PetCo and ask one of their staff your question. Every dog is different depending on their digestive system, and you don't want to give your dog something that will disagree with her stomach or nervous system.
Is There Over The Counter Drug I Can Give My Dog In Small Doses To Help Her Relax On Her Plane Ride ?
You can give a dog a childrens dose of benedryl or a 5-10mg valium depending on theh size of the dog.