The 12 animals map to the 12 Earthly Branches:

Rat=子 | Ox=丑 | Tiger=寅 | Rabbit=卯 Dragon=辰 | Snake=巳 | Horse=午 | Goat=未 Monkey=申 | Rooster=酉 | Dog=戌 | Pig=亥

'I'm a Tiger' = your YEAR branch is 寅. But you also have month, day, hour branches — three more 'animals.' Your zodiac year is just 1 of 4.

See all 4 branches: https://tarofortune.pythonanywhere.com/en