In Nagrand, slightly west of the Horde city, there is a huge field. You can find Clefthoof bulls there. (And you can find them under the Laughing Skull Ruins) I spent a half an hour yesterday grinding them for Knothide Leather and Clefthoof Leather (Which has a very decent drop rate from them) I made 30g from 2 stacks of Knothide, and then 15g from 5 Clefthoof Leather. I'm only a warrior, so I'm sure a mage or warlock could make a hell of a lot more there. Happy skinning guys.
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There's another place in Blades Edge Mountains that is passed the far north mountainpass, only accessible by flying mount. They are 70-72 level mobs. Amber Clefthoofs I believe they are, but their droprate on Thick Clefthoof Leather, according to Wowhead, is better than that at Nagrand. So if it's overcamped in Nagrand, I sugguest going up to BEM.
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