The Labrador Retriever certainly has a lock on the hearts of American dog lovers. For the eighteenth straight year, the Lab has topped the American Kennel Club's list of the nation's 10 most popular purebred dog breeds. The top 10 dogs are ranked as follows: Labrador Retriever, Yorkshire Terrier, German Shepherd Dog, Golden Retriever, Beagle, Boxer, Dachshund, Bulldog, Poodle and Shi Tzu.