the trailers for a live-action and CGI Marmaduke movie I've been seeing (beyond the obvious things wrong with them, including their very existence), and I finally realized what it was.
Unlike Garfield, whose two similarly live-action and CGI movies turning a profit despite the howling of critics and the sad head-shaking of the public at large no doubt lead to the creation of a Marmaduke movie, Marmaduke doesn't talk. Not to people, not to the audience, not to other animals. And yet he can't shut up in these things.
I doubt there are any Marmaduke fans out there with enough affection and dedication to the single-panel cartoon to be able to support the designation of "Marmaduke purist," but whether or not your cartoon animal protagonist is merely a dumb animal or a sarcastic chatterbox would seem pretty fundamental to the creation of a film based on said cartoon animal protagonist, wouldn't it?
Also, the Phil in the movie doesn't have a mustache like the Phil in the comic.