The amazing doggy sense of smell has fascinated me for years. I’d written about how the military uses this talent so effectively on my previous book, “Dogs on Duty,” and now I had a chance to expand on our partnership with canines that depend on their sense of smell to identify just about anything we’d like to find–a stash of drugs, the poop of an endangered species, the presence of a symptom of illness in a person, even the presence of bed bugs deeply hidden under a hotel mattress–the list goes on and on. I loved meeting many great dogs and their human trainers and handlers while working on this book, and I’m confident readers will be just as wowed by these talented animals as I am.

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