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It's one of the biggest comets! Big enough that it's reached hydrostatic equilibrium and has become round, which is coincidentally the criteria required for it to be called a "dwarf planet" as well. Compositionally, it is indistinguishable from a comet, and formed in the same region as most comets (the Kuiper Belt - the same place that 67P was formed!). If it were moved closer to the sun, the ices on its surface would begin outgassing, just like a comet, however because of its larger mass and escape velocity, the gasses would be mostly bound to the surface instead of making a tail (at first, of course over time that atmosphere would escape and Pluto would lose enough mass that its atmosphere would begin to form a tail).