Originally, the yorkshire terrier, or yorkie, was bred to hunt vermin, hence their small size. Additionally, the toy breed of silky haired puppies and dogs is exceptionally intelligent, loyal and energetic. For owners and caregivers of any yorkshire terrier, it becomes apparent quickly that they must quickly provide an adequate outlet for their pets to expell some of its energy. High strung yorkshire terriers, especially while they're still puppies, can border on the line of intolerable.