There are likely thousands of dwarf planets waiting to be discovered beyond Neptune. Initially Pluto was considered as a full-sized planet, why did it lose that tittle? Together we will know the reason.
In 2006 Pluto was reclassified as a dwarf planet because it did not meet the requirements set up for full-sized planet. Pluto met first two requirements; It orbits the Sun, it has nearly a round shape. But it has not cleared its orbital path from other objects. Currently 5 dwarf planets have been discovered, located near Kuiper belt, far away from the Sun.