The Marmaduke comic isn’t even trying to hide it anymore; Marmaduke is a serial killer. We had all suspected for some time now, but now it’s official canon. It’ll be interesting to see where they take the strip from this point on. Will Marm become an anti-hero, like Dexter, cleaning up the streets while still satisfying his bloodlust? Or maybe he’ll just keep eating babies, like the monster that he is.
I have to say that the female owner is being cautiously optimistic here. When a hellhound enters your living room with a snow shovel in his mouth, the first thought probably isn’t “I think someone wants you to search for buried bones.” Unless that somone she’s referring to is the FBI. It’s just as likely that Marmaduke is telling the family to dig their own graves. Or, that the sidewalk is snowy and needs shoveling. Marmaduke hates slip and fall injuries and the inevitable lawsuits that come with them. (That might be why he prefers to leave no survivors)
Assuming he does want the owner guy to search for buried bones, the question becomes why? Is he a trophy collector, like the Predator? Does he want to relive his favorite kills? Maybe he’s just concerned about the feds snooping around and he needs to dump the evidence in the river. The only thing we know for sure, is that the owner family’s backyard has more corpses than the house from Poltergeist. And we all know how that turned out.
Final Verdict: Marmaduke is the world’s greatest monster.