[Mithuial]

k, let me refer you to the Silmarillion, Chapter 2 "Of Aule and Yavanna." This was before the coming of elves and Aule was kinda bored and really wanted some people to whom he could teach craftsmanship and lore, so he made the dwarves, but he hid it from the other Valar. Yavanna, his wife, when she found out about it was upset that she hid it from her, and she said, "Yet because thou hiddest this though from me until its achievement, thy children will have little love for the things of my love." Yavanna of course loved trees and things that grow. So, my opinion is that because the dwarves had little love for things that grow and the elves had much love for them they had some strife between them. Plus, when elves and dwarves first met the elves thought they were kinda "uncouth." I think that has something to do with it. I don't know how complete of a job a did explaining that, but there ya go.