Chinese astrology is based on 12 Animals as per Chinese Calendar Year!
Each year is represented by One animal and that comes in cycle.
The 12 Chinese horoscope animals are: Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, Pig.
Each animal has its basic charecter and astrology is predicted according to the same.
Chinese calendar year does not start on January 1st. They have their own calculation and mostly it starts from mid of January - like month of 'Thai' for Tamils. Sometimes, the year starts from middle February.