This little ball of gas and dust, pair shaped as it is, with it's little brother Charon, acts like a comet more than it does a planet. All the other planets conform to an orbital plane, Pluto doesn't. At certain times of the year Pluto is closer to the sun than Neptune is and cuts through Neptune's orbit. Clearly the characteristics of a comet and not a planet.
Not much bigger than our moon and considered a rogue object from the Kuiper Belt, Pluto is still on the radar. It is, still, in our solar system.
Keep asking questions.
Extremophiles.
FNK