The Yorkshire Terrier, (often called simply the Yorkie), is a breed of small dog in the toy category. The long-haired terrier is known for its playful demeanor and distinctive blue and tan coat. Yorkies can be very small, usually weighing between 5 and 7 pounds (2.5 to 3.5 kilograms). Based on registrations, Yorkshire Terriers became the #2 most popular dog breed in the United States in 2006 according to the American Kennel Club, trailing only the Labrador Retriever.