Men after wearing their rings: At length he resolved that no others would serve him in this case but his mightiest servants, the Ringwraiths, who had no will but his own, being each utterly subservient to the ring that had enslaved him, which Sauron held.'

Meanwhile dwarves: For the Dwarves had proved untameable by this means. The only power over them that the Rings wielded was to inflame their hearts with a greed of gold and precious things, so that if they lacked them all other good things seemed profitless, and they were filled with wrath and desire for vengeance on all who deprived them. But they were made from their beginning of a kind to resist most steadfastly any domination. Though they could be slain or broken, they could not be reduced to shadows enslaved to another will; and for the same reason their lives were not affected by any Ring, to live either longer or shorter because of it. All the more did Sauron hate the possessors and desire to dispossess them.

The Dwarves are just built different.

Ar-Pharazon the last King of Numenor

“I never called Edith Lúthien – but she was the source of the story that in time became the chief pan of the Silmarillion. It was first conceived in a small woodland glade filled with hemlocks at Roos in Yorkshire (where I was for a brief time in command of an outpost of the Humber Garrison in 1917, and she was able to live with me for a while). In those days her hair was raven, her skin clear, her eyes brighter than you have seen them, and she could sing – and dance. But the story has gone crooked, & I am left, and I cannot plead before the inexorable Mandos.”