Yeah, but it's like a bonus dwarf planet too. About as half as big as Pluto...
Pluto's moon Charon is over half the size of Pluto itself, leading astronomers to originally classify the Pluto-Charon system as a "double planet." They were also considered "binary planets" because the smaller Charon doesn't actually orbit around Pluto, rather Pluto and Charon orbit a common gravitational center (the "barycenter') located above Pluto's surface.
So call it a planet helper. Pluto has a heck-of-a-job keeping its orbit clean....
Here on Erf we call it "tides".