Dis was the only named dwarf-woman in Tolkien's
Gimli said that there are few dwarf-women, only
about one-third of their population.
They seldom travel and then for great need. On a
journey, they dress as the dwarf-men do. Since they are also similar to
dwarf-men in voice and appearance, usually other peoples cannot tell them
apart. For this reason, Men have the opinion that there are no
dwarf-women and that the Dwarves grow out of stone.
Because of the fewness of dwarf-women, the Dwarf
population increases slowly, and is in peril when dwellings are scant.
Dwarves take only one spouse in their lives and, as
in all things, are jealous of their rights.
Less than one-third of dwarf-men take a wife. Many
dwarf-men do not wish to marry, as they are too busy with their crafts.
Also, not all dwarf-women take husbands, as they may not have an
interest in marriage, or some desire dwarf-men they cannot have and
will settle for no other.
Reference: Return of the King,