One day, a powerful dog named Max was playing in the yard. He saw a big nail on the ground. Max did not know that the nail could hurt him. He thought it was a toy.
Max's friend, a little bird named Lily, saw the nail too. She said, "Max, be careful! That nail can make you suffer!" But Max did not listen. He thought he was too powerful to get hurt.
Max played with the nail and, suddenly, it poked him. He cried and cried. Lily tried to help, but it was too late. Max learned that even powerful dogs can suffer from small things like nails.
