It is assumed that black dogs are animals of the gates of hell. There is also a black dog ghost that roamed in Hanging Hill, Connecticut, United States. If you are in the area, then you do not accidentally see the dog ghost is on the loose, the myth is not long then death will approach you. Myth, the ghost can still change shape, not just a black dog but various forms.

Mind the mythical story in Mexico, there is a figure of a big black dog known as Cadijo. Cadijo is going to haunt a naughty young man walking alone at midnight.