I remember when I first read Terry Pratchett's novels and he had female dwarves with beards I thought he was just having fun with the fact that all of Tolkien's Dwarves seem to be male, but imagine my surprise to find a passage somewhere in the HOME books where it was actually stated that female Dwarves were bearded! There is a mention, anyway, that you can't tell the males from the females, who rarely travel and when they do, they look like the males, so people assume they are. Given that all the Dwarves we meet seem to have beards,it's the logical conclusion that the women (including Dis?) DO have beards!
I think, anyway, that it was all a matter of Tolkien's Boys' Club attitudes. He just didn't think. The first time he writes about the ancestors of the Dwarves, they're all male. Another (later?) version has them put to sleep with their mates. Durin is the only one who doesn't have a mate, yet somehow he has a line of descendants who are very proud of the fact. Tolkien's fiction is filled with "the fathers of the fathers of ..." whoever. The only time it seems to occur to him that you do need both genders is in the matter of the Ents. Ah, well. I love him anyway.
And for the record, in my moments of whimsy, i have always speculated as to whether any of Thorin's companions might just have been female ...
