The Great Dog Demon was a powerful yokai lord who was known throughout Japan. Never formally addressed with a name, he fathered two sons by two different mothers: Sesshomaru from an unnamed dog demoness, and Inuyasha from a human woman (unnamed in the manga, but named "Izayoi" in the third movie). The Great Dog Demon is first mentioned in chapter 12 of the manga as Inuyasha's father, "a demon dog that prowled the lands of the west".
The Great Dog Demon's major foe in the manga was the dragon Ryukotsusei, whom he could not kill but sealed onto a cliff face with his claw; Myoga calls this battle the "cause" of his death. In the third Inuyasha film, Inuyasha the Movie: Swords of an Honorable Ruler, the Great Dog Demon survives long enough to save Izayoi and their newborn child Inuyasha; still weak from his battle with Ryukotsusei, he dies defending them from a human foe.
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