Since Pluto is a small ice chunk, it does not quite settle into these two categories and is more similar to a satellite or moon (Weintraub 45).
One of the criteria for any object to be categorized as a real planet is that it must have “cleared the neighborhood around its orbit." The mass of Earth is approximately 1.7 million times higher than the mass of all other objects within its orbit. Unfortunately, the mass of Pluto is only 0.07 times higher than the mass of its other orbiting objects. Consequently, in 2006 Pluto was officially relegated to a ‘dwarf planet’ (Weintraub 98).
More objective minds have lately decided to remove Pluto from the list of planets surrounding the sun. There are some objects that are larger than the Pluto that would qualify to be included to the list of planets if really Pluto was deliberated a planet (Weintraub