The average canine has about 50 times the olfactory sensors as you do. That means he can smell things you can’t (and many times wouldn’t want to). That’s why police use breeds like Bloodhounds, Labradors, German Shepherds and Belgian Malinois for everything from rescue work to tracking down criminals on the run, sniffing out trapped or lost people, or finding bombs or a joint in a traveler’s pocket at an airport.
But imagine how discerning a dog’s sense of smell has to be to determine if your gun has a serial number or not.
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