Merrie Melodies - Farm Frolics (1941)

Farm Frolics is a 1941 Warner Bros. Merrie Melodies cartoon supervised by Bob Clampett. The short was released on May 10, 1941.
Notes:
This is one of the cartoons that Warner would occasionally produce that featured none of its stable of characters, just a series of gags, usually based on outrageous stereotypes, plays on words, and topical references, as a narrator (Robert C. Bruce) describes the action. The dog was spotted in 1988's Who Framed Roger Rabbit toward the final scene.
The vocal group heard at the beginning is the Sportsmen Quartet, who often harmonized in Warner Bros. cartoons of the period, later becoming the resident singing group on Jack Benny's radio and TV shows. It is also on 50 Classic Cartoons Volume 3.
This cartoon was re-released issued into the Blue Ribbon Merrie Melodies program on November 15, 1949.

This cartoon fell into the public domain in 1969 in the United States when United Artists, the copyright owners to the Associated Artists Productions package, failed to renew the copyright in time.

The mouse with the big ears would reappear in Horton Hatches the Egg, an adaption of a book by Dr. Seuss that Clampett also directed. He's seen telling the other animals that Horton is sitting on a tree.