In the traditional Chinese zodiac compatibility scheme, the Horse is opposite the Rat.
The Rat and Horse stand six positions apart in the 12-animal cycle, making them an opposing pair in traditional zodiac relationship systems. The Rat begins the sequence, while the Horse occupies the seventh position. This opposition is often called a clash or conflict pairing in popular Chinese astrology.
These pairings belong to the system of earthly branches, in which each animal represents one branch. Rat corresponds to Zi and Horse corresponds to Wu. Their branches are positioned across the cycle from one another, which creates the traditional opposition.
Opposition does not mean that every person born in a Rat or Horse year is incompatible. Interpretations vary across astrologers and communities, and zodiac compatibility is a cultural belief rather than a scientific measure of relationships.