As Bennie and the dog go off to play, I see a teenage kid about my age trying to sneak away, pulling at a big mutt. "Oh, leaving so soon? I'm just getting started!"
The boy stumbles and falls to all fours as his arms and legs suddenly become a perfect match to those of his dog. His clothing vanishes, showing his still-human body as it starts to develop a brown and black fur.
The dog is a neutered male, but I fix that with a thought. I also add some new ideas to the love he already has for his master. Tail wagging madly, the big mutt sniffs his master's butt and starts to lick it.