A friend of mine has specially trained dogs that track down escaped convicts. (He even has a few buckshot imbedded in his torso as a reminder of his job)! He said as a test, they took men and bathed them in scent blocker and then dressed them in carbon suits and covered every part of their body. He said the men then were asked to take a long trek through the woods and hide. He said the dogs trailed them up like they had no scent cover on. I guess this would be the same for a deer being able to smell a human.
