The following article contains an answer for the question: Who provides the voice for the horse when it sings "I'm Happy About the Whole Thing"? , can you please find it? 

The cartoon starts with the arm of an animator drawing a farm scene. The farm scene then colors itself, and the camera zooms in just as the plot follows:

A realistic-looking horse is seen, whinnying (courtesy of Mel Blanc), and a comic triple plays out: The narrator asks the horse to do a trot; the horse obliges. The narrator asks for a gallop; the horse again obliges. The narrator then asks the horse to do a "canter". The horse turns from realistic to a cartoon horse, with the bugged eyes of, and singing "I'm Happy About the Whole Thing" (by Harry Warren and Johnny Mercer) in the style of, the vaudeville star Eddie Cantor, vocally impersonated by Kent Rogers. The narrator admonishes the horse, which grins sheepishly.
The family dog is seen lazing on the porch, springing to alertness when the newspaper arrives. The dog makes a mad dash to the end of the driveway, gets the paper, comes back to the porch, and immediately starts to read the paper himself, starting with the Sunday comics. He turns to the audience, and says, "I can hardly wait to see what happened to Dick Tracy!" (This gag would be used by Clampett again in The Great Piggy Bank Robbery.)
A hen leaves her eggs unguarded, and a mean-looking weasel stealthily creeps into the henhouse while the narrator frets. Just as he is about to grab the eggs, they all hatch at once, and the chicks shout "BOO!" in unison. The frightened weasel evokes a Joe Penner catch-phrase, "Don't ever DOOO that!" and gasps as his heart pounds.
An owl is hooting dully until it briefly smiles while saying "Who's Yehoodi?"
A few birds put a little twig, a bit of string, and piece of straw until they make a house approved by the Federal Housing Administration, singing, "There's no place like home!"
A worried field mouse with huge ears is asked about what worries him; he claims "I don't know, Doc. I...I just keep hearing things."

Kent Rogers