How Much Better Are Dogs' Noses Than Ours?

Articles say 1,000 to 10,000 times better, but that's probably still an underestimate.

Working dogs are everywhere. Police dogs are part of search and rescue teams. Customs inspectors use specially trained pups to search for illegal substances entering countries. It’s no wonder, dogs have 50-times the number of small receptors as humans, and devote 40-times more brain capacity to smells. But just how good this makes their sense of smell i…