The mass of Pluto is less than a number of moons. Another oddity is that Pluto is tidally locked to its own moon, a moon which is closest in distance and size to the planet it orbits. This is two ways in which it is more like a moon than a planet. All moons in the solar system are tidally locked to the planet they orbit and none of the planets are tidally locked – the closest is mercury which is tidally linked to the sun with a 3/2 ratio (That gives mecury a few peculiarities such as a day-length which is twice as long as its year).
So the compromise of “dwarf planet” is a good one, where it keeps Ceres company. Though, Pluto should really be called a double dwarf planet. Notice that if you follow the idea of defining planets by the spherical shape that means Ceres joins the club along with a large number of objects in the Kuiper belt.