At Oakwood Elementary, Muffin the dog was the sweetest, friendliest pup anyone had ever met. But one day, Mojo, the class bully, decided to pick on poor Muffin. He would tease the dog, pull his tail, and even take his favorite toys.

Muffin was heartbroken and didn't know what to do. He felt scared and alone, until one day, his best friend Kitty the cat stepped in to help. Kitty had seen Mojo's mean behavior and knew she had to do something.

"Leave Muffin alone, Mojo!" Kitty said bravely. "He's my friend, and you need to stop being so mean to him." Mojo just laughed and tried to shove Kitty away, but she stood her ground, refusing to back down.