Source:http://linkedlifedata.com/resource/umls/id/C0324431
NCI: The Labrador Retriever is a solid, muscular dog, with a short, hard, water-resistant double coat that does not have any waves. It comes in solid black, yellow, or chocolate. There is also said to be a rare silver or gray color. The medium-sized ears are pendant. The webbed feet aid in swimming. Height: 21-24 inches (53-61 cm.) Weight: 55-75 pounds (25-34kg.) (dogbreedinfo.com)