McDuff - Ghostly sheep dog on the live-action comedy MCDUFF, THE TALKING DOG/NBC/1976. McDuff was the ghost of a hundred year old English sheep dog who haunted the veterinarian office of Dr. Calvin Campbell (Walter Willison). Jack Lester supplied the voice of McDuff which on l Calvin and other animals could hear. Other people in Calvin's life included Kimmy Campbell (Michelle Stacy), his little sister, Mrs. Osgood (Monty Margetss), the housekeeper; Amos Ferguson (Gordon Jump), the Campbell's neighbor and Squeaky (Johnnie Collins III), his young nephew.