Dogs have as many as 300 million olfactory receptors in their noses, compared to only 6 million found in a human nose. On top of this, the portion of a dog’s brain devoted to smell is 40 times greater than ours.
Dogs can smell substances at a concentration of one part per trillion, the equivalent of one drop of liquid in an Olympic-sized swimming pool. With the right training, dogs are capable of sniffing out bombs and drugs, tracking missing people, finding dead bodies, and even detecting disease. Cancer, diabetes, tuberculosis, and malaria are all able to be sniffed out by dogs, even without the human exhibiting symptoms.
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