Zoo is Company (1961)

Loopy helps an elephant with a mouse problem and that mouse is Bigelow Mouse.

Producers	Hanna-Barbera Productions
Original title	Zoo is Company
Directors	William Hanna, Joseph Barbera
Writers	Michael Maltese

Cast

Daws Butler

as Loopy De Loop (voice)

Doug Young

as Driver / Painter / Elephant / Mouse (voice)