This is actually part three in a series... this one shows how Mickey is just basically white privilege embodied. In the broader scope of the series, Goofy is the field negro, Pluto is the house negro, Donald is the socially-elevating but volatile Irish Catholic and Chip and Dale are illegal immigrants/native Americans depending on the scenario.

"Dippy Dawg" was Goofy's slave name

That's when they colorized this cartoon from the 30's.