1. The sensation of a brisk wind against your face carrying with it scents and fast-moving sights is appealing to many humans. So imagine speeding against the wind with the ability to sniff up to a million times better and to perceive movement at a much quicker pace. For a dog, sticking its head out a moving car must be an all-around sense-sensation the magnitude of which we olfactory-challenged humans can only imagine!
2. Everyone wants a better view. Dogs are no different.
3. Dogs sense what every teen instinctively knows: it's inherently cooler to travel on wheels than by foot.
