When your dog gets car sick and vomits, you can roll down the car window to allow the air to circulate in the car, which can alleviate the symptoms of your dog’s car sickness. The main reason your dog gets car sick is because he hasn’t adapted to the bumps of the vehicle. At this time, it’s recommended not to let your dog get car sick. Take your dog out for a ride as soon as he has finished eating. It is best to wait two hours after eating before going out, which can reduce the chance of your dog getting motion sickness.