The third and final Dennis digest--hey, I just noticed--Marvel Digest Group? What's that about?
"The Case of the Soggie Doggies", "Rough & Tough", "The Day The Sun Went Out", "Ruff's Family Tree", "Short and Sweet", "Movie Mischief", "Ring Around A Margaret", "Ruff the Beachcomber", "Dog Days", "The Quitter Sitter", and "A Ruff Life."
Was Marvel maybe thinking of a whole digest line? If so, grabbing the rights to a comic strip that was past its prime seemed like an odd way to go--Garfield Comics Digest woulda been a smash at the time--so this title remains an obscure blip in Marvel's publishing history.
Ketcham's art, however, remains cool--even if this stuff is ghosted from his style(thanks for the tip Craig!).