For dog lovers, one of the silver linings of the coronavirus pandemic has been witnessing the swelling of our ranks. What began as a trickle last spring became a torrent in summer and fall: dog adoptions and puppy pictures. On Twitter I mostly follow journalists, foreign policy experts, and current or former government officials. In recent months the normally staid posts in my feed were frequently interrupted by “Some personal news: welcome to the family [Astrid or Gus or Lola or Caesar]!,” accompanied by a mug shot of a wide-eyed pup. These announcements always brought me a flash of joy ...