Origin

Way, way back, early humans were afraid of the dark. They had fire which gave them light and warmth, but beyond the firelight was a mystery. In the darkness, humanity imagined great beasts waiting to eat them if the fire went out. This fear created the Tiger God. Humanity was not alone though. They domesticated canines into dogs. They lived with them and hunted with them. They became their protectors, and the love those dogs had for them created the Dog God.

Creation

The Dog God first appeared in Doctor Strange (2023) #17 by Jed MacKay and Pasqual Ferry

Major Story Arcs

Blood Hunt

When Varnae possessed Blade and filled the sky with darkforce in an attempt to take over the world for vampirekind, one of their first targets was Doctor Strange, who was turned into one of the bloodsuckers. Strange helped the Avengers in his astral form, leaving his vampiric body susceptible to being possessed by Victor Strange. Bats, the ghost dog who lived in the Sanctum Sanctorum, prayed to the Dog God for help.

He appeared and made Bats his avatar so that Bats may save his master's body from Victor. As Bats lives on the astral plane, with his new power, he was able to bite only Victor's astral form and rip it from Strange's body. This also took the vampire infection from Strange's body for when Strange returned to his corporeal form. Once Strange's body was safe, the Dog God left Bats, claiming that his power was too much for Bats to take. That Bats would burn out if he held the power any longer.