The two scariest things my mother ever said to me were ‘I thought you would have a family by now’ and ‘that little dog will be yours someday.’ Most days, if I’m working, I ignore my mother’s dog. If she’s really feeling neglected, she will stretch to her full height, which isn’t much, and push against me, her forepaws in the small of my back. At night, when I sleep on the couch — it’s always on a...