My dog's middle name is TheDog. Houston Thedog. Not officially, but when she's in trouble, I say "Houston The Dog! What are you doing?! No!". I'm a nerd.
Hilarious! My SIL always uses "Marie" as the middle name with her pets when she's scolding them.
She has a beagle named Cinnamon. When Cinnamon gets in trouble, it's always "Cinnamon Marie!" Even when one of the family members crosses her, she'll throw out the "Marie" and you'll know someone has pushed her buttons!