The last time I mentioned Garfield minus Garfield, it was back in 2008, when it first came out.
Without the presence of Garfield, the resulting strips consist mostly of Garfield’s owner, Jon Arbuckle, interacting with himself, rather than with his pet cat. The strip’s website characterizes this result as “a journey deep into the mind of an isolated young everyman as he fights a losing battle against loneliness and depression in a quiet American suburb.” Garfield creator and artist Jim Davis has commented on the webcomic, stating that he is an occasional reader and finds it “fascinating” and an “inspired thing to do”.
Apparently, Paws, Inc. published its own Garfield Minus Garfield from 2008-2010, and resumed publishing in 2012.