Experts recommend that you do not force your pet into the car. The best way is to get it used to this routine from an early age. Remember that positive reinforcement is always a better way to educate your dog than punishment. That being said, using snacks as a reward may not be the best idea before getting into a vehicle.
If your pup gets dizzy and eats a treat before your trip, it may get an unsettled stomach and could even throw up. Love and stroking are, therefore, the recommended reward. Besides, you should start by taking short car trips in the beginning. You can then start increasing the length of your rides as your animal gets used to it.