After your dog gets car sick, it is best to stop the car or drive slower, and then open a window to let the dog breathe and relieve the symptoms of discomfort. You can also prepare toys for your dog in the car to distract your dog and avoid motion sickness. It is usually best to let the dog stay in the car for more time and get familiar with the environment in the car. After the dog adapts to the environment in the car, then gradually drive on the road. If you repeat it a few times, the dog will not get carsick.