The Shooting of Dan McGoo is a cartoon directed by Tex Avery and starring Frank Graham as the Wolf.
The cartoon starts off as an adaptation of Robert W. Service's poem in spoof of The Shooting of Dan McGrew, complete with a literal depiction of a man with one foot in the grave.
The story begins in Coldernell, Alaska—Population 324 and getting smaller—a wild, rough town where gold is king while gambling, drinking, and shooting each other are the major activities.
The wolf resents his joke ("T'ain't funny, McGoo"—a play on a catchphrase from the radio show Fibber McGee and Molly) and draws out a giant switchblade knife, about to end Droopy's life, until he stops and hears the fanfare for the lady known as Lou making her appearance.
The latter gasps and hides under the bar, revealing the woman in the half-finished painting, it says, "I ain't got no body" in the middle.