How more sensitive is a dogs sense of smell compared to a humanbeing?
I read that a dog can smell a fingerprint for six weeks. Also read they can smell one drop of urine in ten gallons of water. The smelling receiver is made up of a mucous, a labyrinth of innumerable folds that could cover a surface of 130 m2 compared to the 3 m2 that humans have. The dog has 120 to 220 million cells next to man’s 5 million cells. Its smell is so developed that it can detect the lightest environmental change. As a matter of fact, the dog can detect the change of character of other dogs or humans that surround them, just by detecting the slight increase or decrease of their hormonal levels and their sweat. This has nothing to do with a sixth sense: the dog can just detect certain signals that go unnoticed by humans. Even so, tears of joy contain different substances than those of sadness or pain and dogs are able to tell the difference. The sense of smell of dogs enables them to follow the cent of a wild animal and locate it; track missing persons; search for people burie
