They were originally used for catching rats in clothing mills in the 19th century. (animalbehaviorcollege.com)
This breed was developed during the 19th century for the purpose of catching rats in clothing mills — the Yorkshire Terrier was also used in the sport of rat - baiting until it became more popular as a companion pet. (pawster.com)
Yorkshire terriers caught rats in clothing mills in the 19th century but later became European high society companions. (cuteness.com)