This movie used to be shown on the TV in the '60's and was probably made and set in the 1950's. I think it was Italian. The main character is a misanthrope who pretends to be a dog and barks when people knock on his apartment door. One day, a witch knocks at his door, and as he is barking through the keyhole, she says,"So, you want to be a dog? Be a dog." and he is turned into a St. Bernard. The rest of the movie is about him learning to be human from his experiences, until he commits a selfless act and is transformed back into a man. I can still remember the scene where he walks, naked and in a dog collar, away from a stunned crowd. I would love to see this film again!