Chocolate Labs are the rarest of the three types of Labrador retrievers that originated in Newfoundland. Although the origins of chocolate labs can be traced back to eight original bloodlines, chocolate was not considered an official Labrador retriever color until the 20th century when the American Kennel Club began to register them as purebred dogs.
Chocolate Labs have a deep, instinctive desire to please their masters, a trait which makes them highly desirable within search-and-rescue teams as guide dogs for the blind and as narcotics detection dogs, according to the American Kennel Club. Because they were originally used to help their masters catch fish and pull in fishing nets, the dogs are highly skilled at retrieving sporting items, such as flying discs.
Chocolate Labs have a naturally stable temperament, which makes them one of the most popular family dogs in the United States. Labradors are fairly easy to train and have water-resistant coats, and these factors also contribute to the reason for their widespread popularity.
Because of their recessive breeding heritage, two full-blooded black Labradors can give birth to a chocolate Lab puppy. Therefore, it is also possible for two chocolate Labs to give birth to a black Lab puppy, although these occurrences are rare.