"It" is a pronoun commonly used to refer to an animal in Engpsh, regardless of the animal's gender. The pronoun "it" is a neutral pronoun in Engpsh and is used to refer to objects, animals, or even concepts that do not have a gender.
Example sentences:
Look at that cat. It's so cute.
看那只猫，它非常可爱。
The horse is fast. It won the race.
那匹马很快，它赢得了比赛。
It's raining.
它在下雨。
Note: In Engpsh, animals may also be referred to using gender-specific pronouns such as "he" or "she," especially if their gender is known.