You get what you pay for--a dog's nose has 2 billion odor receptors, 40 times as many as a human's--but there are limits to what even the military is willing to spend on an animal.
Other studies have concluded that people give off different body odors that correspond to certain emotional situations, but what hasn't been shown is whether other people become a little stressed after smelling the body odor from stressed people, Wysocki said.