Alexandra Horowitz, the author of the lively, highly informative New York Times best selling blockbuster Inside of a Dog, explains how dogs perceive the world through their most spectacular organ, the nose, and how humans can put their under-used sense of smell to work in surprising ways.

To a dog, there is no such thing as "fresh air." Every breath of air is loaded with information. In fact, what every dog -- the tracking dog, of course, but also the dog lying next to you, snoring, on the couch -- knows about the world comes mostly through his nose. Alexandra Horowitz, a research scientist in the field of dog cognition, unpacks the mystery of a dog's worldview. With her family dogs, Finnegan and Upton, leading the way, Horowitz sets off on a quest to make sense of scents, combining a personal journey of smelling with a tour through the cutting edge and improbable science behind the olfactory powers of the dog. From revealing the spectacular biology of the dog snout, to speaking to other cognitive researchers and smell experts across the country, to visiting detection-dog training centers and even attempting to smell-train her own nose, Horowitz covers the topic of noses -- both canine and human.

Alexandra Horowitz, author of the bestseller Inside of a Dog, explores what dogs know in even greater depth, following their lead to learn about the dog's spectacular nose and how we mere humans can improve our underused sense of smell. Here Horowitz, a leading researcher in dog cognition, continues to unpack the mystery of a dog's nose-view, in order to more fully understand our companions. She follows the dog's nose--exploring not only its abilities but the incredible ways it is being put to use. Because human noses are so inconsiderable in comparison--we have but six million olfactory receptor cells while dogs have hundreds of millions--we have difficulty conceptualizing what dogs can perceive. To a dog, there is no such thing as "fresh air." Every breath is full of information. Dogs, when trained, can identify drugs of every type, underwater cadavers, cancer, illicit cell phones in prison, bedbugs, smuggled shark's fins, dry rot, land mines, termites, invasive knapweed, underground