Once upon a time, there was a friendly dog named Spot. Spot liked to play with his ball and run in the park. One day, he saw a sack near a big truck. Spot was curious and wanted to see what was inside the sack.
Spot went to the sack and opened it with his teeth. Inside the sack, he found black rocks called coal. Spot didn't know what coal was, but he thought it would be fun to play with. So, he took some coal out of the sack and started to play with it.
But soon, Spot's paws and fur got all dirty from the coal. His mom saw him and was not happy. She said, "Spot, you made a big mess!" Spot felt sad that he made his mom upset. He had to take a bath and was not allowed to play with the coal again.
