Dwarfs or Dwarves?
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A quote from Appendix F of the master work Lord of the Rings:

"It may be observed that in this book as in The Hobbit the form dwarves is 
used, although the dictionaries tell us that the plural of dwarf is 
dwarfs. It should be dwarrows (or dwerrows), if singular and plural had 
each gone its own way down the years, as have man and men, or goose and 
geese. But we no longer speak of a dwarf as often as we do of a man, or 
even of a goose, and memories have not been fresh enough among Men to keep 
hold of a special plural for a race now abandoned to folk-tales, where at 
least a shadow of truth is preserved, or at last to nonsense-stories in 
which they have become mere figures of fun. But in the Third Age something 
of their old character and power is still glimpsed, if already a little 
dimmed: these are the descendants of the Naugrim of the Elder Days, in 
whose hearts still burns the ancient fire of Aule the Smith, and the 
embers smoulder of their long grudge against the Elves; in in whose hands 
still lives the skill in works of stone that none have surpassed.

It is to mark this that I have ventured to use the form dwarves, and so 
remove them a little, perhaps, from the sillier tales of these latter 
days. Dwarrows would have been better; but I have used that form only in 
the name Dwarrowdelf, to represent the name of Moria in the Common Speech: 
Phurunargian_ For that meant 'Dwarf-delving', and yet was already a word 
of antique form. But Moria is an Elvish name, and given without love..." 

Therefore, our spelling of the plural is dwarves.  And that's that.