Three years ago today, Mrs. Orr and I looked outside and saw a dog standing at the end of our driveway. Spotted and hyperactive, he was romping around, amusing himself by chasing birds and sunbeams. He clearly belonged to someone, because he was wearing a collar. “What a funny looking dog,” said my wife. “Yeah, he is,” I replied. We left the house to run some errands. When we returned, the funny-looking dog was sitting in the front yard, sunning himself. When we exited the car, the dog leapt and bounded and cavorted all around us, trying to jump on us and ignoring our shouted commands to get DOWN, GET…