Who's Walking the Dog?

While they were on Spring vacation, Lily and Drew Tate finally got the puppy of their dreams! They were very responsible about walking Jack, so he wouldn't have accidents in the house. When school resumed and their parents went back to work, the family spread newspapers on the floor for the dog to piddle on. When they got home the first day, the papers were unsoiled. By week's end, there were still no messes. The family began to worry and consulted the vet, who was equally perplexed."Who's walking the dog?" they all wondered.