What skills? Only _everything_ entailed in your claim that they can at will penetrate heavily-guarded underground Dwarf tunnels and steal anything you want to say they can steal! Which brings me back to my puppies. Even coming _somewhat_ close to the giftedness of your kittens, there is NO WAY they would attempt to _swallow_ the Elvish cloaks, in whole or in part.
So as soon as the Elf-baby tells them to sit, the largest of the puppies tells her, "Look, it was nice of you Elves to help us when you _thought_ we were choking, but we weren't choking. In appreciation of your kindness, we'll stop chewing stuff of yours; but contrary to Elvish propaganda, our loyalties are still with the Dwarves. We're heading home now." And the puppies dash home.