Why is the man standing next to Pharaoh on the mummy mural a dog's head?

The kobold on Egyptian murals is Anubis.

Anubis is the patron saint of the soul in the theological system of ancient Egypt, which appears as the head and body of a wolf in the murals of Pharaoh's cemetery.

Anubis is a god of death in ancient Egyptian mythology and is sometimes regarded as the god of the underworld. He is the son of Seth and Nefertis. His name is pronounced more like "Ampu" in hieroglyphics.

Anubis has the head of a wolf (or other canines), and the wolf is his symbol. The image of this jackal is closely related to its role in mythology. Because the jackal is a scavenger, a scavenger of corpses, which is closely related to death. He is also considered as the guardian of the dead. In works of art, Anubis is depicted as a man with a wolf's head, ears pricked up and a whip in his hand.

Anubis was originally the king of the underworld, but with the worship of Osiris, he became a gatekeeper. As a janitor, Anubis' main duty is to compare the soul of the deceased with Matt's feathers on the balance. If the soul is as light as a feather, Anubis will take him to see Osiris, or feed him to Anmit.

The worship of Anubis may even be earlier than Osiris. In Unas's text (line 70), he is associated with the eye of Horus. In the Book of Death, he oiled Osiris's body, wrapped it in linen woven by Ai Xisi and Nefertis, and put his hand on Osiris's body to protect him.