Labrador retriever, labrador retrievers, dog, dogs, lab, labs, retriever, retrievers, breed, breeds, pure breed, pure breeds, hunting dog, hunting dogs, gun dog, gun dogs, mammal, mammals, domestic, domestic dog, domestic dogs, canine, canines, sporting dog, sport dog, sporting dogs, sport dogs, puppy, puppies, genetic variation, genetic variations, white, cream, golden, yellow, black, feeding, breast feeding, milking, mother