The story is told of a small dog which had been struck by a car and was lying by the side of the road. A doctor, driving by, noticed that the dog was still alive, stopped his car, picked up the dog, and took him home with him.

There he discovered that the dog had been stunned, had suffered a few minor cuts and abrasions, but was otherwise all right. He revived the dog, cleaned up the wounds and was carrying the animal from the house to the garage when suddenly it jumped from his arms and scampered off. "What an ungrateful little dog," the doctor said to himself. He thought no more about the incident until the next evening when he heard a scratching at the door. When he opened it, there was the little dog he had treated with another hurt dog.