For Larry.... From an article in the Outdoor hub
A whitetail deer’s long nose offers a lot of room for scent interpretation, and the deer has olfactory receptors throughout both nasal cavities—more than 800 times as many olfactory receptors as a human has, in fact. There may be olfactory receptors on the outside of the deer’s nose as well. This may be why they tend to lick their noses to moisten them, which helps them pick up scents and smells.
But we’re not done, there’s more. The whitetail deer has an organ on the roof of the mouth that also interprets smells. It’s called the Jacobson’s organ and it can sort out smells that come through the mouth.
While a human’s brain is much larger than a deer’s, a comparatively small area of the human brain is dedicated to analyzing odors. The portion of the brain dedicated to analyzing odor in a whitetail’s brain is much larger than that of a human’s, despite the fact that the brain is much smaller. In a deer, more brain power is dedicated to analyzing odors than any other brain function.
In all, some studies have estimated that the whitetail deer’s ability to smell is about 10,000 times stronger than a human’s. And they are good at sorting out the odors, too. In one study, it was determined that deer could separate at least six different odors when they are mixed together. Think you are going to “cover” your odor with a dollop of skunk cover scent beside you? Nope.