To be classified as a planet a celestial object needs to meet three criteria: 1. It must be in orbit around the sun. 2. It must have sufficient mass to assume hydrostatic equilibrium (a nearly round shape). 3. It must clear the neighbourhood around its orbit. This means it has to be large enough and have enough gravity to get rid/absorb any other objects (save those in it's gravity, i.e. moons ) in it's orbit. Pluto does NOT clear the neighbourhood of it's orbit and therefore is not a planet. Dwarf Planet ≠ Planet.
Sincerely, it's been seven years. Get over it.