A cat uses ventriloquism to torment a dog. Plus dynamite.
The structure is the usual one for a Tex Avery cartoon: one gag after another, until the length of the cartoon is used up.... although there is an ending that's a bit different in tone from the rest. Here, as always, Avery's gags are beautifully composed and executed, with a little fillip at the end of each to induce a further giggle, that makes him one of the great cartoon directors at Termite Terrace at the start of the 1940s, each with their own style. Alas, Avery's theatrical cartoon career would last only another eight years, before the declining economics of the industry drove him to the ad business... where he would prosper, as befitted his genius.