Why?

Tom the cat stands on a green lawn holding a pie, while a large bulldog on a leash lunges at him with its mouth open. Tom dodges the attack, then uses a series of objects—first a pie, then a pair of cymbals, then a red balloon, and finally a baseball bat—to repeatedly strike the dog, causing it to recoil and react with exaggerated expressions. The scene takes place outdoors on a grassy field under a blue sky.