Kyo is a stubborn, hot-headed boy. He is easily provoked and angered in any situation. As with most of the Sohma clan, Kyo is cursed with becoming an animal of the Zodiac when hugged by someone of the opposite gender. His Zodiac animal is the cat which, in legend, was barred from becoming one of the official twelve animals because of the rat's trickery. Kyo hates the current rat of the family, Yuki, as a result. The two constantly fight and Kyo loses every time.
Source from Wikipeida