Once upon a time, there was a dog. This dog was very stubborn. He liked to play in the mud all day long. His family tried to change him, but he did not want to change. He loved the mud too much.
One day, the dog met a new friend. This friend was a little bird. The bird did not like the mud. The bird asked the dog to play in the grass instead. The dog was stubborn, but he liked his new friend. So, he decided to try it.
The dog and the bird played in the grass all day. They had so much fun. The dog learned that he could change and still be happy. He was not so stubborn anymore. The dog and the bird were best friends forever.
