If you can take your pet with you, avoid letting him or her “over drink” on the trip, as a result of stress. This can lead to vomit spells. (Of course, be sure to let your pet get enough liquids during the ride!)
One way to prevent your pet from over drinking is to get a kid’s sand pail; fill it with ice; and let the ice melt. As it melts, the pet can drink from the pail — but because the ice melts slowly, your pet can’t over drink!