Once upon a time, in a small house, there was a boy named Tim. Tim had a thick leather ball. He loved to play with it every day. One day, a big dog came to play with Tim. The dog was very strong and wanted to play with the ball too. Tim said, "Let's play together, but be gentle with my ball." The dog wagged its tail and they began to play. They would throw the ball and pull it back. They had lots of fun. But then, the dog pulled the ball too hard. The thick leather ball broke. Tim was very sad. He tried to fix the ball, but it was too late. The dog felt bad too, and walked away with its head down. Tim learned that not all playmates are careful with our things.