Once upon a time, there was a little boy named Tim. Tim really wanted a puppy to play with. One day, he saw a powerful puppy near his house. The puppy was big and strong.
Tim went to the puppy and said, "Hi, puppy! I want to play with you." The puppy looked at Tim and wagged its tail. They played all day and had lots of fun. Tim was very happy.
But then, something unexpected happened. The powerful puppy started to grow even bigger! It grew so big that it could not play with Tim anymore. Tim was sad and said, "Bye, big puppy." The big puppy walked away, and Tim never saw it again.
