Pluto is King Mickey's loyal pet dog and also appears to be a messenger for him in some Kingdom Hearts games. He debuted in the 1930's animated cartoon The Chain Gang. Pluto appeared in all games released so far, except Kingdom Hearts 358/2 Days.
Pluto is a dog that bears a vague resemblance to a blood hound, particularly in his long, black, droopy ears. He has short, yellow fur and large, close-set eyes. He has three toes on each paw. Pluto's long tail is very thin and black, more closely resembling his master Mickey's tail than that of a dog. His collar is green and loose.
Pluto is Mickey's loyal friend. Although he does not appear often with his master, their friendship is easily seen. In Kingdom Hearts II, Pluto is shown to take a liking to Kairi, and becomes her source of comfort. When Axel kidnaps Kairi, Pluto pursues the two through a Corridor of Darkness, and later comforts her while they were locked in the Castle's basement.