Labrador Retrievers are the most popular dog breed in the United States. Called Labs for short, people can’t get enough of their charm and lovability. Labs are also very altruistic. Your good-hearted friend who likes to help the elderly cross the street? They’ve got nothing on a Lab. These dogs are gentle, intelligent, and easy to train, making them excellent guide dogs for the blind, loyal members of search-and-rescue teams, and faithful K-9 officers.