Black Labrador Retriever Calendars: These Retrievers are strongly built, very active dogs. They are wide over the loins with strong and muscular hindquarters. Black used to be the favorite among fanciers, but now yellow has taken on this role. Labs have medium length drop ears and a brown or black nose. Labrador Retrievers are easy to train and are good with children and other dogs. The Labrador Retriever is good natured, loyal and hardworking. Labrador Retrievers are employed as guide dogs and sniffer dogs, detecting drugs and explosives. They are very intelligent animals, able to pick things up quickly. The Labrador Retriever should never be aggressive, they are good tempered and very agile and make a devoted companion who has a strong will to please. Enthusiastic tail-waggers, the Labrador Retriever is a dog who enjoys simply being around their human companions. Black Labrador Retriever Calendars.