House ad for Leading Comics #24 (April-May 1947); printed in World's Finest Comics #27 (March-April 1947)
Comic cover art: pencils and inks by Otto Feuer (?)
Hey, that's a pretty impressive all-star line-up of anthropomorphinals, but where's Flop? Where, oh where, is Flop?
Oh, he's right here!:
Cover of Flippity & Flop #4 (June-July 1952), pencils and inks by Jim Davis (no, not that one)