this picture will never not be funny
just the absurdity of donald duck putting out that statement (which even makes some sense and fits donald’s overall depressed mood) and mickey mouse being the sly one and contradicting donald, coming out with the upper hand from the argument, is just so amusing.
When he says “fight or perish”, maybe he means fight for your right to party. Dog of course refers to I Wanna Be Your Dog by the Stooges. The ego perishes under the weight of uncontrollable love.