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Inugami (犬神) is a spiritual entity rather than a real being to be utilized in one of the black magical methods called Ko-jyutsu (蠱術).
In a word, a magician kills an animal such as a dog with giving extreme sufferings and pains to the animal, it’s the black magic to shift resentment of the killed animal to a hateful opponent or an object of jealousy.
This black magic called Ko-jyutsu (蠱術) was so prevailing that the prohibition (禁令) for the undesirable trend was socially applied about 10 〜 12 th centuries around Western Japan.