The Gytrash is a legend from northern England, a being that may take the form of a dog, a horse or a mule. It haunts lonely roads, awaiting for travelers to lead astray, for what they are much feared. They can also be benevolent, though, guiding lost travelers to the right road. It is also referred to as "Shagfoal" in some parts of Lincolnshire and Yorkshire, where the form of a spectral mule or donkey with eyes that glow like burning coals are believed to be malevolent.
A nice companion to the Will-of-the-Wisps, huh?