Demon-shaped category:

The appearance of a ghost in the form of a walking man with a dog's head belongs to a series of entities which, not at will, were given the antimatter soul form of a dead dog.
This phenomenon occurs because the dog's souls are over-accustomed to their owner.
When a dog dies, his soul usually fuses with the human entity when he goes to astral output in his sleep.
However, after the death of a person, his soul has a part of the dog's antimatter, and that person cannot reincarnate and therefore frightens in the surroundings where people are usually nearby.