Barghest

Overview
In Northern English folklore, the Barghest or Barguest is a mythical monstrous black dog with large teeth and claws, though in other cases the name can refer to a ghost or household elf, especially in Northumberland and Durham, such as the Cauld Lad of Hylton.

Yorkshire Dales
One notable case is said to frequent a remote gorge named Troller's Gill in the Yorkshire Dales, Yorkshire, England. A ballad entitled "The Legend of the Troller's Gill" can be found in William Hone's Everyday Book (1830). It recounts the tale of a man who ventures forth "to the horrid gill of the limestone hill" in order to summon and confront the Barghest in an act of ritual magic. The man's lifeless body is discovered soon after with inhuman marks upon his breast.

York and Whitby
A Barghest (or Barguest) is said to roam the Snickelways and side roads of York, preying on passersby, and has also been seen near Clifford's Tower. To see the monstrous dog is said to be a warning of impending doom. Whitby is also associated with the spectre.

Darlington
In the 1870s a shapeshifting Barghest was said to live near Darlington and was said to take the form of a headless man (who would vanish in flames), a headless lady, a white cat, a rabbit, a dog, or a black dog. Another was said to live in an "uncannie-looking" dale between Darlington and Houghton near Throstlenest, and yet another haunted an area of wasteland between Wreghorn and Headingley Hill near Leeds.