A Self-Made Mongrel(1945)

Overview

A wealthy eccentric owns a talking mongrel dog, and the dog, deciding to upgrade his pedigree, decides he is a born watch-dog. The owner puts on a mask with the intention of breaking into his own house and testing the dog's abilities. But, before he breaks in, a real burglar does so, and has taken over the house and the self-proclaimed self-made protector.