Final answer:
The Scorpion is not represented in the Chinese Zodiac, while Sheep, Monkey, and Horse are part of the twelve-year zodiac cycle. So, Scorpion is the right answer.
Step-by-step explanation:
The animal that is NOT represented in the Chinese Zodiac among the options provided is the Scorpion. The Chinese Zodiac, known as Shengxiao, is based on a twelve-year cycle, with each year in the cycle related to an animal sign.
The animals officially included in the zodiac are the Rat (or Mouse), Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat (also referred to as the Sheep), Monkey, Rooster, Dog, and Pig.
In the list provided for the question (Scorpion, Sheep, Monkey, Horse), the Sheep, Monkey, and Horse are all part of the Chinese Zodiac cycle.
The Scorpion, however, is not featured as it is often associated with Western astrology, specifically the sign of Scorpio in the zodiac.
So, Scorpion is the correct option.