Baby Peggy, her mother, and her grandfather leave the police station, and the stray dog follows them out the door. When the dog crosses the sidewalk toward the car, he picks something up off the sidewalk and starts eating it. Quick cut to a closeup of the dog with his mouth open, tongue out, panting. Clearly the trainer left a treat on the sidewalk to get him to stop in the right spot, just behind the family getting into the car.