German Shepherds are among the most common police and military dogs because they combine intelligence, trainability, a strong nose, and protective courage. That makes them useful for everything from patrol to bomb and drug detection.
A German Shepherd police dog named Trakr, brought from Canada to help at Ground Zero after the 9/11 attacks, is credited with locating Genelle Guzman-McMillan, the last survivor pulled from the rubble.
The Rottweiler nearly died out in the late 1800s when railroads replaced cattle drives and the dogs lost their main job. Their new careers as police and guard dogs helped save the breed.
In the early 1900s, Rottweilers were among the first breeds used as police dogs in Germany, thanks to their strength, intelligence, and protective instincts.