The German Shepherd (German: Deutscher Schäferhund, German pronunciation: [ˈdɔʏtʃɐ ˈʃɛːfɐˌhʊnt]) is a breed of medium to large-sized working dog that originated in Germany. In the English language, the breed's officially recognized name is German Shepherd Dog (GSD). The breed was officially known as the  Alsatian in the UK from after the First World War until 1977 when its name was changed back to German Shepherd. Guide Dogs Queensland in Australia also trains only Labrador Retrievers and Golden Retrievers.German Shepherds are still used for herding and tending sheep grazing in meadows next to gardens and crop fields. They are expected to patrol the boundaries to keep sheep from trespassing and damaging the crops. A study conducted by the University of Zurich  found that 45% of the police working dogs were affected by degenerative spinal stenosis, although a small sample size was used.