Morgoth had the Orc by the hair and was glaring at him.
“Whatyawant? You said not to train him so him stay mean.”
“Start with stronger cages, GO FIX IT.” Morgoth released the hair and left the Orc in a painful heap. He followed the trail of mud, dirt, burns, droppings, and blood back to his private chambers. In his bedroom, the trail ended in the remains of the bed. Glaurung hopped out of the wreckage and started wiggling, spreading dirt and smashing furniture. Morgoth knelt down and Glaurung turned up to have his belly rubbed.
Even Dark Lords like pets.