Neo-Assyrian Head of Pazuzu, Circa 8th-7th Century BC
Pazuzu was an Assyrian and Babylonian demonic god of the 1st millennium BC. He normally has a dog-like face like here, and where his body is depicted he has a scaly torso, a snake-headed penis, the talons of a bird and usually wings.
Although Pazuzu was a malevolent force, his image was used on amulets to ward off his enemy Lamashtu, a female demon that preyed on newborn babies and their mothers. The amulet was either worn by the mother or child and larger ones were placed above their bed on a wall.
His legend was adapted and used in The Exorcist films.