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 hi