Have you noticed some dogs putting their heads out of cars? It is really a bad habit. It is said that dogs like to do so because they are curious about what they see. Many dogs are not tall enough to have a clear  of the outside world from the front seat, and most dogs are too short to see clearly from the back seat. Trying to put their heads out of the window is a good way to  out their surroundings and enjoy a nice, cool breeze at the same time.

    It's actually not a good idea for dogs to do so. If your dog becomes overexcited and falls or jumps from your  car, it could injure itself. Some dust in the wind can make some dogs sick. High-speed wind can a dog's ear. Plus, dogs can be easily injured by flying small stones or other things. So, be careful when you take a dog with you in a car.