In Japanese mythology an inugami ("dog god") resembling, and usually originating from, a dog, (although other similar species are interpreted as being. e.g., Wolves, Raccoons, and Weasels.) and most commonly carrying out vengeance or acting as guardians on behalf of their "inugami owner". Inugami are extremely powerful and capable of existing independently, (without master or possession) as well as turning on their "owners" and even possessing humans. Even so, while Inugami can betray their masters, they may also be the loyalest of companions.
"A dog spirit said to possess people in Japanese lore. Those possessed are in a state of "inu-tsuki," and lose conciousness. Onmyoji used them as familiars."
—Shin Megami Tensei: Strange Journey Compendium
Raidou Kuzunoha vs. King Abaddon
Inugami appears as an optional boss in Dark Tsukudo-Cho, where he says he is born not of mother and father, but hatred. After his defeat he says he does not want to disappear and so asks Raidou to make him his demon. Depending on the choice he will wish to be reborn as a demon that brings happiness to others if he is allowed to die, while he joins Raidou if he wants to have him. Afterwards Astaroth appears after enjoying the fight.
