takes advantage of laws meant to help the disabled for personal gain.

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How good is a dog's sense of smell?

A dog’s sense of smell is said to be approximately 1,000 times more sensitive than a human’s. While humans have 5 million olfactory receptors, dogs have about 220 million, an immense difference. This article goes into detail about the structure and process of the dog’s olfactory system: http://www.aces.edu/pubs/docs/U/UNP-0066/