Without resorting to a head or neck shot, where do you aim to drop a deer in its tracks?

I am directing this more towards shotgun hunters. So far, every whitetail deer I have shot has run after the shot. Rifle shots seem to drop them always on the hunting shows that I watch. Double-lung shots are what I have always taken. They never get too far. But I wonder if there is still a better place I can aim, like for the shoulders or heart.