http://pareidolon.tumblr.com/post/25274167476/garfield-minus-o die
this was the only one that I could find, which implies that Garfield's eating Odie. Slightly less existential. I wonder if Jim Davis thinks about these things when writing the strips.
Kinda unrelated but I always wondered about the signature in the comics. It seemed like the ones I found funnier were the ones with Davis' signature at the end panel, not the first or second.
Also it says this song's from Silent Hill 4, and it sounds a lot like Bat For Lashes, Chelsea Wolfe, Lisa Ices, lots of really recent female-driven groups, nearly 10 years after that game came out.
If all the Garfield comics were like this, I think I would have been a bigger fan. And, er, I guess it wouldn't be called "Garfield"... more like "The life of John"