The Biewer Terrier, also called the Biewer Yorkie & Biewer Yorkshire, is a toy breed terrier who is closely related to the Yorkshire Terrier. He is a very happy, spirited and intelligent dog. Since he is a small toy breed, he can be somewhat difficult to housetrain and it takes dedication and persistence to fully housetrain him. The Biewer Terrier can be a noisy little dog, he is also high energy. He is wary of strangers and will display some nervousness when meeting new people or dogs. A fenced yard will keep him safe when he is exercising, but he should never be left out alone. Birds of prey can easily pick him up and carry him off.