How would you like it if you were dependent on some lazy buttermung to open the door every time you had to pee?
Like your whole urinary tract is screaming in agony and the lazy fuck won't let you pee. Your bladder feels like it's full of fire ants that have been dipped in contact cement and then rolled in crushed glass and then dipped in habanero sauce.
Smart dog determined what idiotic gimmick was preventing the human from getting out of bed. All the rest was a gradual, phased approach to non-violent disagreement with the human as pack alpha. Smart dog.