Labrador retrievers have extended their record run as America's most popular dog breed. The breed is topping the American Kennel Club's rankings for a 26th straight year. The rankings also Rottweilers are enjoying some renewed favor, and bulldog breeds are holding their regained ground. After Labs, the top 5 are German shepherds, golden retrievers, bulldogs and beagles. The Rottweiler's Number 8 ranking was its highest in almost 20 years.