Pluto, the planet, was discovered in 1930 and was considered the 9th planet of the solar system from 1930 until 2006. In 2006, Pluto was re-evaluated by scientists and astronomers and since it did meet all the requirements for planetary status was reclassified as a dwarf planet.
Pluto, the dog, is Mickey Mouse's pet dog. Pluto, the dog, is considered one of Disneyland's "Fab Five", the 5 main cartoon characters created by Walt Disney himself. As part of the Mount Rushmore of Disney's cartoon characters which also Mickey, Minnie, Donald Duck, and Goofy, Pluto, the dog, has achieved lofty status in Disney echelon. Other than being Mickey's dog, I'm not sure why Pluto fits in with this group. The dog, other than being cute and lovable, does nothing as far as I can tell.
You can understand the status of Mickey and Minnie even if their relationship through the years makes no sense at all. Mickey and Minnie are the real king and queen of Disney characters. "Fab Five?" You bet. You can understand Donald Duck, a classic character, whose ill tempter makes him one step away from a full on expletive laden tirade. Fab Five material?" Sure. Goofy.... well he's everyone's uncle Dave, the well meaning relatative who tries hard but is basically.....an idiot. "Fab Five?" He's funny, absolutely. But Pluto? Pretty darn useless if you ask me.
I don't know a lick about the history of Walt Disney animated characters. Maybe there is something about Pluto that makes Fab Five worthy. I haven't seen it yet. Maybe the status of Pluto, the dog, needs to be re-evaluated and devalued like Pluto the planet was a few years ago. If you want to be at the top, you have to earn your way there. It can't be just handed to you just because you're cute and like to be scratched behind the ears....
Then again. What do I know?