Why are dogs able to smell 1,000 times better than humans? It may have to do with an organ in their mouth—one which some humans have, but has stopped functioning over the millennia of evolution, writes StanleyCoren
We have deliberately bred some types of dogs to have scent discrimination which is 1,000 to 10,000 times more sensitive than that of humans.
Pheromones are biological odorants that evolved as a means of communication, usually between animals of the same species. Dogs have a second scent-detection organ specifically tuned to recognize and interpret pheromones and other biologically relevant odors.ability of dogs appears to be prodigious when compared to that of humans. It has been estimated that the sensitivity of dogs to odors may be 1,000 times, or even 10,000 times, greater than that of people .
Some dogs, in particular the dogs that we call"scent hounds," have noses that are designed to be very wide and deep in order to pack the largest number of odor analyzing cells into the available space—even if the dog itself is not very large.
How do these numbers of scent-detecting cells in the dog's nose compare with those in humans? Human beings are not very smell-oriented, and one of the reasons for this is that we have noses that contain a paltry 5 million smell analyzing cells. This means that the average human being has a nose that contains only 2 percent of the number of odor analyzing cells that can be found in the nose of the little beagle.But that huge number of olfactory receptors in dogs is far from the whole story.
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