YOU SAID:

My cat does not like fish fingers because they have fish in them

INTO JAPANESE

私の猫は魚が入っているので魚の指が好きではありません

BACK INTO ENGLISH

My cat doesn't like fish fingers because they have fish in them

INTO JAPANESE

私の猫は、魚が入っているので、魚の指が好きではありません

BACK INTO ENGLISH

My cat doesn't like fish fingers because they have fish in them