The Yorskhire Terrier is a breed that was developed in the 19th century in the land of Yorkshire, England. The "Yorkie" was bred to remove the pesky rodents that were located in clothing mills. Upon its early creation, these dogs were once ranked as working dogs. They have since retired to a more house-friendly lifestyle and are often seen as fitting with the upper-class.
http://en.wikipedia.org/wiki/Yorkshire_Terrier
http://www.dogbreedinfo.com/yorkshireterrier.htm
http://www.akc.org/breeds/yorkshire_terrier/