The following comics are from a Garfield storyline in October of 1989 where Garfield wakes up completely alone. It's an oddly jarring piece of work with different art style than what was normally used in the comic at the time.
According to the 20th Anniversary book, Jim Davis wanted to do something different with Garfield for Halloween and came up with this short story. As he said, what's scarier than being alone?
I can't remember where I read it but Davis said the "experiment" only lasted a week because he didn't want to alienate readers or upset the syndicate.