Access listings dealing with Yorkshire Terriers. Topics include breeders, pet pages, rescues and shelters. The Yorkshire Terrier is a small sized toy dog with a life expectancy of between 12 to 15 years. This dog was bred in the north of England as a working dog to tackle vermin in the clothing mills. Originally larger than the present size, the breed evolved into a much smaller more compact dog and today's Yorkshire Terrier is sometimes considered a fashion dog.