Once upon a time, there was a healthy dog named Max. Max liked to run and play all day. One day, Max saw a rail near a park. Max went to the rail to start a new game.
Max started to walk on the rail, but he saw a big ball rolling fast. The ball was coming right at Max! Max jumped off the rail just in time. The ball rolled past Max, and he was safe.
But then, something unexpected happened. The ball turned into a big, friendly cat! The cat said, "Hi, I'm Sam!" Max and Sam became best friends. They played on the rail and had fun all day.
