Vomit happens. Sometimes even humans get carsick. Most cats can overcome motion sickness through desensitizing them by repeat short, uneventful trips. Gradually accustom the cat to spending time in the car with the engine off, then with the engine on, then short trips, then the cross-country adventure. Prior to a trip be sure the cat has had food and water available, then remove food and water at least three hours before you set off. You can also use anti-motion sickness medications to help settle the stomach and prevent the sometimes prolific drooling that occurs in a nauseous cat. Most medications used to prevent motion sickness are very safe antihistamines and many cats eventually will travel without the aid of medical assistance. Just in case, bring a roll of paper towels.
The cat that goes bonkers when in a vehicle demonstrates hyperactivity. These cats aren?t sick, they?re possessed! Salivating, panting, whining, jumping from front seat to back, swatting at non existent butterflies and trying to cling upside down to the roof of the car are common characteristics of the hyperactive feline traveler. If you must bring the hyperactive cat with you, medication to sedate the kitty will surely make the trip safer, easier and less stressful for both you and the cat.