An Extreme Cousin for Pluto? Possible Dwarf Planet at Solar System Edge
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Was Jupiter a dwarf planet before it cleared its orbit?
Was Earth a dwarf planet shortly after its collision with Theia, when there was presumably debris left in orbit?
The further away a body orbits from its star, the more unreasonable it is to expect a planetary body to clear the neighbourhood around its orbit. Not even a large gas giant could hope to do it at far enough distances. What do we call those? Pluto could have easily cleared its orbital neighbourhood if it was close to the Sun like Mercury.
The exoplanet 2MASS J21265040-8140293 is separated from its star by 7400 AU. Its unlikely that planet is clearing its orbital neighbourhood, yet we don't declare it an "exo-dwarf-planet".
Also Earth is no longer a planet because its orbit is filled with satellite junk.
Over many orbital cycles, a large body will tend to cause small bodies either to accrete with it, or to be disturbed to another orbit, or to be captured either as a satellite or into a resonant orbit. As a consequence it does not then share its orbital region with other bodies of significant size, except for its own satellites, or other bodies governed by its own gravitational influence. This latter restriction excludes objects whose orbits may cross but that will never collide with each other due to orbital resonance, such as Jupiter and its trojans, Earth and 3753 Cruithne, or Neptune and the plutinos.
That sounds like a Borg name. ;)