I'd actually think of a Dwarf owning the most
practical knife possible. No fancy shapes, just the best shape imaginable for all tasks. They are master crafts...errr...dwarves (can't call them crafts
men, can I?

) and I would think as a result they would automatically carry the best possible knives, whatever the shape. The angularity I think would come in with regard to etching and designs. I can imagine runes being especially popular, or some of the more angular knotwork designs of Celtic/Germanic/Nordic artists.