"Vapor wake dogs" are the latest tool the pentagon is using to detect bombs. The canines have super-sensitive smell receptors that allow them to analyze vapors emitted from explosives from hundreds of yards away.
"Where we might be able to smell a woman's perfume walking by, but the dog can smell not only the perfume, but the clothes, the material she's wearing, the shower gel she washed with that morning," Paul Hammond explained.
There's another upside to deploying the dogs -- they can easily blend into any environment because after all, they're just Labradors. But they're not cheap. Each specially-trained dog costs upwards of 20,000.