Sabotloader explained this perfect, I do the same. As for the shot that drops the animal in there tracks look at sabotloaders pic of the deer's anatomy above. Where the shoulder bone-spine connect if you place your shot here you will most likely drop the animal in there tracks everytime. If looking at the deer this would probably be considered a neck shot, some consider it a shoulder shot. Also this is NOT your best shot, you have to be exact on your shot placement or you will miss the spine and hit non-vital area, or hit in the neck and miss the arteries. Or worse you'll not do enough damage on the shoulder and loose the deer as it will run away, far, then eventually die.
Your best shot is a behind the shoulder, heart-lung area, hit here the animal will run away, but will die.
(BP)