Tannery (Dwarfs) is a Dwarfs resource building in Total War: Warhammer. It is not just the meat that is used, animal skins and furs certainly have value also.
A tannery takes the skins of animals and subjects them to a process known as 'liming'. This toughens and preserves them, gradually turning them into leather. A tanner will also preserve pelts by using a complex salting, oiling and waxing process.