It is no longer technically a planet, but a dwarf planet.
because it to small
the terristrial planets(inner planets) are made of rock, they are soild, the jovian plants (gas giants or outer planets) are made of many gases, and Pluto doesn't not fit in any category, Pluto is a dwarf planet that is possibly a moon.
Pluto does not interact with any planets.
Pluto does not have an orbit clear of asteroids and debris. Planets do.
Pluto ... which I think was the first member of the newly-defined "dwarf planet" category ... has two known moons.
Pluto has asteroids in its orbital path. Planets don't.
pluto
It was regarded by scientists as being "too small" to be classed as a planet. So they put it into the category of Dwarf Planets.
Pluto's only neighbouring planet is Neptune, though there are other dwarf planets beyond Pluto
There are more than two dwarf planets other than Pluto. Ceres, Eris, Sedna, and Qaoar are a few of the named ones, but there are dozens, if not hundreds, more of them.
Pluto
There are 8 planets not including Pluto and 9 including Pluto.