Allowing your dog to let it stick its head out the window is a very dangerous habit because their eyes are exposed to dirt, rocks, dust and other debris. These materials can easily puncture and scratch your dog’s eyes. Damage to the ears is another big concern. When the dog’s ears flap in the wind, his soft ear flaps (pinnae) can easily become irritated, swell and become very tender. The constant and rapid flapping of the pinnae against your dog’s head from high-speed winds causes trauma to the ear and results in s Repeated trauma such as this can cause lifelong problems for your pup. Pets must always be properly restrained in a vehicle and remain inside – even their noses!