Before Bob Clampett became the star cartoon director at Warner Bros.*, he mostly directed Looney Tunes starring Porky Pig in various low-key roles. "Pied Piper Porky" casts the stuttering swine as the famous rat-removing character. After Porky discovers that a smug mouse has decided to stay, he sics a cat on the rodent, but things don't go as planned.
So, this is mostly a relic of what I would call Warner Bros. cartoons' pivot point: they were already really wacky, but not yet reflecting the absolutely zany imagery of animation's infancy. Worth seeing.
*From about 1936 to 1940, Tex Avery was the star cartoon director, with gag-centric classics such as "I Love to Singa", "The Isle of Pingo Pongo" and "A Wild Hare" (which debuted Bugs Bunny). Following his departure in 1941, Bob Clampett became the star cartoon director, turning out phantasmagoria-like classics such as "A Corny Concerto" and "The Great Piggy Bank Robbery". Following Clampett's departure in 1946, Chuck Jones became the star cartoon director; his cartoons were more intellectual.