Marmaduke is trying to eat his pathetically naive owner-girl's lunch.

Marmaduke becomes a whirling dervish of spinning tail and gratuitous onomatopoeia when eating dinner. His owner-girl's androgynous friend wandered too close to the grisly scene, and his or her ass paid a hefty price.

Marmaduke attempts to trade his owner-girl his dog biscuit for her cookie, but she isn't having any of it, even though Marmaduke could probably just take the cookie if he wanted to and eat her for good measure (since, as today's strip clearly demonstrates by giving us a close-up of Marmaduke and girl next to each other, he is ABSOLUTELY FUCKING HUMONGOUS).

Marmaduke displays an absurdly stuck-up and finicky type of brand loyalty when chasing cars.

Marmaduke's owner-man thinks his dog is asking for a bone. In fact, Marmaduke is actually "raising the roof" in regards to the incredible fishing success his owner-man had just detailed.

Marmaduke asked for and was granted a rear entrance to his doghouse, just so his tail could fit out the back. Presumably his owners were willing to carry out such an asinine request because of how enormously impressive it must have been for a dog to communicate such a specific desire.