Bill or Sandy: You might want to try contacting the folks at the King Ranch gift shop down in Kingsville, Tx. I believe they sell a few items of "hair on" furniture, bags, etc. and, if they are willing to take the time, could probably point you to some companies that actually do the work.
I know there have to be a lot of companies (perhaps small mom & pop type craftsmen) that do that sort of thing because you can see a wide variety of such goods at places like the commercial sales area of the Houston livestock show --- sorry, but I can't recall any other names offhand. Arnold Ziffle