U.S. Customs and Border Protection K-9s are an integral part of securing our nation's borders. Using their extraordinary noses, these dogs detect smuggled narcotics, concealed humans, and can even locate victims stranded in the desert. At the Canine Center in El Paso, a class of green dogs is training to become America's newest crop of K-9 teams. Over the course of seven weeks, they'll run a gauntlet of drills designed to mold them into some of the most elite working dogs on the planet. Border Hounds offers an inside look at how these incredible animals are trained and deployed along one of the most dangerous stretches of border in the United States.

Follow some of the best NYC police dogs as they put their lives on the line sniffing out hidden bombs, fighting crime and defending the subways. In a city that's a prime target for international terrorism, the jobs of these working dogs - charged with safeguarding the Big Apple against crime and terrorism - are never done.