What animal does the cow's head and horse's face refer to?

Cow's head and horse's face refer to the legendary two ghosts, one with the head of a cow and the other with the head of a horse. Metaphor is all kinds of ugly people. Not zodiac.

The zodiac is an intuitive representation of the twelve earthly branches, namely, Zi (mouse), Ugly (ox), Yin (tiger), Mao (rabbit), Chen (dragon), Si (snake), Wu (horse), Wei (sheep), Shen (monkey), You (chicken) and Xu (chicken). In modern times, more people regard the zodiac as the mascot of the Spring Festival and become an entertainment and cultural activity.