Blowin in The Wind - Take care when opening the car window

I've always had a threshold of comfort for leaving the windows open for the dogs. This is a good guideline:

Roll the window down only enough for the dog’s head to fit out. Never lower the window as far as the dog’s chest level because she can jump out if she sees something to chase. Also, she could be thrown out of the car if you happen to be hit from the side.