Pluto (also known as Pluto the Pup) is a popular character from The Walt Disney Company. Pluto is most frequently appeared as Mickey Mouse's pet dog. Pluto is unusual for a character in Mickey's world, in that he is not anthropomorphized beyond showing an unusually broad range of facial expressions; he is actually represented as a normal dog. His birthday is September 5, 1930. Pluto's original name was Rover.