Muffins National Flag - from the Steven Colbert's Lost Twilight Zone Episodes
A unique flag appears on the Steven Colbert Show, the Muffins National Flag. In a parody sketch in the CBSVault of Television, "lost episodes" of the Twilight Zone a man awakens to new world order where their formerly deceased dog is now the leader of the world.
A picture of the dog with flag can be seen in a photo. The colour is impossible to make out, but it most likely is red with a white disc with a black paw print.