Blue Collar Dogs (DVD)

National Geographic follows a group of four-legged forces to be reckoned with in today's workplace. They diagnose bladder cancer by the smell of a patient's urine. They bust drug smugglers hiding massive quantities of marijuana. They locate people trapped in the rubble of collapsed buildings. And they apprehend criminals fleeing the scene of the crime. Their work is challenging, stressful and often dangerous, but for the thousands of highly trained working dogs that clock in for duty each morning, it's all in a day's work. Dogs have forged close work partnerships with humans for thousands of years, and new methods of training dogs to complete complex tasks continue to be pioneered. National Geographic heads to the office with these extraordinary canines and their human partners on jobs that push the limits of their skills. Episodes include Canine MD, Border Hounds, and New York Police.

• documentary
• nonfiction