Over many decades I’ve been the proud parent of many cats but just one dog. And though cats are big-time nappers (who do you think invented the cat nap?) I don’t ever recall wondering if they ever dreamed, or what they might dream about.

Sleeping with the dog has brought those questions front and center.

Front and center is where Cookie likes to be after sliding, gliding, squirming, and sneaking her way into the prime spot in bed, pressed up on both sides against the Big Dogs (me and Mrs. G). Once in place, she quickly shapeshifts and becomes an immoveable 200 pound mastiff, while she a...