Though they are also known as Hellhounds, the Black Dogs do not always mean harm. Word has it that if you don't harm them, they won't harm you. In some cases, they have even purportedly helped lost travelers. But if you find yourself in a position to see a Black Dog, your best bet is to find a descendant of Ean MacEndroe, a man who gained immunity from the Dogs by rescuing a fairy. Better safe than sorry, after all.