Abstract: The invention relates to a transportable stock unit which comprises a stock race mounted on wheels and adapted to be towed behind a vehicle. The stock race has a number of wings swingably connected to the rear end thereof which can be swung out to form at least part of a stock yard. Other screens may be connected with the wings to complete or enlarge the stock yard. Stock may be retained in the yard and herded into the race for any desired treatment without the need to transport the stock to another location. Also disclosed are mechanisms for raising and lowering the wheels of the race so that the race may sit on the ground to stabilize the race. The floor of the race may be raised at one end to form a loading platform and a front gate may also embody a stock holding means for holding the stock while the stock is being treated.