Pluto is smaller than any of the eight planets. Also, it hasn't "cleared its surroundings" - I guess that basically this means that it is not the dominant object in the surroundings of its orbit.
Inner planets differ from outer planets because they have rocky core (excepting Pluto), and the are much smaller than outer planets, which are bigger and take more time to orbit Sun than inner planets because of their location. Outer planets are farther from the Sun than inner planets.
Pluto does not interact with any planets.
Pluto does not have an orbit clear of asteroids and debris. Planets do.
Pluto is a lot smaller than other planets in out solar system. This was not noticeable in earlier years because there wasn't the technology to very accurately compare it to other planets. Because of it's small size Pluto was determined a dwarf.
Pluto has asteroids in its orbital path. Planets don't.
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Pluto's only neighbouring planet is Neptune, though there are other dwarf planets beyond Pluto
All of the eight planets are all lesser planets but Pluto isn't a planet so it isn't a lesser planet
Pluto
There are 8 planets not including Pluto and 9 including Pluto.
Yes, Pluto was a moon to one of the planets called Neptune.
Charon orbits once every time Pluto rotates once. Other moons(including ours)don't do that.