Alike & Different: Differences Between a Real Dog and Pretend "Bob Dog" Mister Rogers' Neighborhood : Season 18 Episode 3

Robert Trow dresses up in his Bob Dog costume so that Mister Rogers can compare a real hound (which he brought) to a man in a dog costume. In the Neighborhood of Make-Believe, everyone except Prince Tuesday knows Mayor Maggie and Queen Sara will trade places for a day. This leads to the inevitable misunderstanding.