Shooting at a deer or any animal that is walking is just like shooting birds in flight.Except for all the shot.

What I mean by this is simply follow thru.If you are following the deer as it walks and are holding on the spot, then the arrow will hit exactly where you are aiming.
If you are trying to time the release then you will run into alot of problems.Don' t ever try this.
I shot a deer walking at 35 yards and hit exactly where I released the arrow.I know others that will do the same with the same results.I also know a guy that tried to compensate on a walking deer and aimed forward,in the shoulder,and hit it right in the shoulder.I also shot a bobcat that was waliking at a decent pace and busted him right thru the heart.
I much prefer to shoot a walking deer than try to stop him with some kind of noise.This will bring a deer to full alert in most cases and when you release the arrow,the deer bolts(jumps the string) and the result is a less than desirable shot.
A fast moving animal is a totally different circumstance and I say take your chances at trying to stop the animal.