When Bingo was Born

THIS IS A FANFIC WHERE I HAVE ADDED DETAILS TO BINGO! Bingo is a young red heeler in the house of the... well, heelers! She loves her family, but after a few days at her Kindy, she notices the other kids making fun of her birthmark, as it looks like a gun. They keep calling her names and saying things, all she wants to do is make them stop... what can she do?