Once upon a time, there was a fast dog named Max. Max loved to run and play all day. He was so fast that no one could catch him. Max was very brave and would dare to do anything.
One day, Max was playing in the park when he found a big bone. He dared to dig it up and take it home. Max was so excited about his new bone. But, Max was running too fast and he tripped on a rock. Max was hurt and needed to see a doctor.
The doctor took Max to a special room with a big machine. The machine was called an x-ray. The x-ray showed Max's leg to see if it was broken. The doctor looked at the x-ray and said, "Max, you are a very lucky dog. Your leg is not broken, but you need to be more careful when you run fast." Max was happy and promised to be more careful when he played.
