Marmaduke tries and fails to re-ignite the flame of passion in his relationship with his distant, careerist owner-man.

Marmaduke is a l33t h4x0r.

Marmaduke considers improving his golf game more important than his owner-lady's social life. Owner-Lady disagrees, but her request for Marmaduke to accommodate her and her friend proves futile.

Marmaduke's paradoxical facial expression fills his owners with a sense of dread.

Marmaduke likes to let the neighborhood kids use his indoor pool. It is possible that Marmaduke's doghouse defies the laws of physics and has a larger interior than exterior, or has a trap door that leads to a large underground cavern/living space, but most likely Marmaduke just has a teeny tiny pool and the neighborhood kids have low thresholds for entertainment.

Marmaduke lives in a world where you can telephone God via a special hotline.