Cantankerous

My little 10 pound pooch. He thinks he is the king of this castle and let's you know it.
He's recently gone blind so is really become dependent on everyone here.
He is so spoiled rotten, doesn't like any outsiders in our domain, but is fiercely loyal and protective of us. Despite all of his cantankerous ways, we love him dearly.
But I do always have to tell him,
"Never bite the hand that feeds you"
especially when I share my m&m's with him.