Daffy Duck and the Dinosaur (1939)

http://filmow.com/daffy-duck-and-the-dinosaur-t41202 "Millions and billions and trillions of years ago," Caspar Caveman (a caricature of Jack Benny) and his pet dinosaur Fido come up against Daffy when they're out duck hunting. Daffy Duck and the Dinosaur Daffy Duck and the Dinosaur