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I have a Police trained K-9 dog. Humans have 6 Million olfactory receptors compared to the average dog at 125 Million. German Shepherds have 225 Million recpetors which is the main reason they are the ones you see used the most in detection work. They can detect chemical differences on a level of 100 million times less in concentration than humans can.
What dogs sniff when they track are the micron sized flakes of skin and sweat molecules that come off you continuously. The human body sheds 40,000 cells per minute. This is why a dog can be brought to a site for example where someone was abducted weeks earlier and still pick up the scent trail if the area hasn't been too disturbed.
You could have a dozen guys all run in a straight line mixing their scents as they each trample over the other person in front of them for miles and then have them go in all different directions and the dog will be able to differentiate and go and follow the suspects pathway.
A dog can pick up on a scent as far as a mile away using airborne scenting.
It was even recently discovered that dogs are capable of smelling cancer cells in humans and so far in tests using cancer detection dogs they have been 100%.
The military is using specially trained mine detection dogs in Afghanistan.
Dogs fossiles have been found next to human sites dating back to 14,000 years ago and some estimate as far back as 100,000 prehistoric ancestors of ours figured out that wolves could be domesticated and used to hunt for food.
If you ever have the opportunity to get a German Shepherd protection trained dog, do it. They are the best bodyguard and will protect you with their life.
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