In the Chinese twelve year zodiac cycle the horse is number seven. The mythology is that all the animals had to race across a river and that was how their order in the zodiac was determined. So why was the horse, so fast and fleet of foot, only in seventh place? That happened because the snake crossed the river by wrapping himself around the hoof of the horse. The horse was frightened and got delayed.
The order for the zodiac is: Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, Pig.