A close friend of mine, Brian, has attention deficit disorder. He also has a dog. They take each other for daily walks. As Brian puts on his coat, hat and boots, the dog lies under the kitchen table, waiting. Brian leaves the house, and the dog doesn’t move. The dog will not budge until Brian has come back into the house for the third time for key, wallet or whatever other items he has forgotten to take the first two times. The dog has learned from experience, which is more than can be said for his owner.