[Marileangorifurnimaluim]

Welcome to the Downs Fyzx (just how do you pronounce that?).

Actually, there are other threads that go into this at more depth, but in short, there aren't any Dwarven ringwraiths. There are only the nine Nazgul, and they are all of the race of Men.

There are various theories why this is the case.

One point made is that Men were particularly vulnerable to works of Sauron, (and his previous master, Morgoth), because they alone had the freedom to create their own course outside the original song of Eru that patterned the world of Middle Earth. This extra freedom entailed greater danger and vulnerability. Also, when Men emerged late into the world at the first dawn of the sun in the East, they were not brought to the Western lands and taught by the Ainur (gods and goddesses of ME) as the elves were. So many followed the evil of Morgoth, the only power they knew.

To get back to your favorite subject, Dwarves were created not by Eru, but by Aule, (god of Smiths), in the imagined image of elves. They were accepted by Eru and given their own minds, but Durin and the others we set to sleep until after the awakening of the Firstborn, the Elves. Elves and Men were imagined in the song of Eru, before evil of Morgoth existed, but the Dwarves were imagined after. Aule made them tough, and specifically resilient to the evil of Morgoth, knowing they would awake unprotected in a world full of his creatures.

So. The Dwarves' natural tendency to greed can be increased by the rings, but they cannot be swayed or changed in their nature.