[The KG9 Kid]

I would expect that there are plenty of Pluto-sized planetoids extending past the orbit of Pluto reaching all the way to the distant Oort Cloud that are technically part of our Solar System.

Probably quite a lot.

[presidio9]

I would expect that there are plenty of Pluto-sized planetoids extending past the orbit of Pluto reaching all the way to the distant Oort Cloud that are technically part of our Solar System.

There are nine recognized dwarf planets beyond the orbit of Pluto. With the exception of Eris (formerly known as Xena), none of these objects are as large as Pluto. Eris is more massive, but slightly smaller in size than Pluto.