Barghest, Bargtjest, Bo-guest or Bargest is the name given in the north of England, especially in Yorkshire, to a mythical monstrous black dog with huge teeth and claws. It is said to frequent a remote gorge named Troller's Gill. There is also a story of a Barghest entering the city of York occasionally, where, according to legend, it preys on lone travellers in the city's narrow streets and alleyways.