I use electric net fencing. I would not trust a multi wire system to keep in Nigerian dwarfs. They are little houdinis! Net fencing for chickens is perfect. It is tall enough they are not likely to jump it, and the holes are small enough even the tiny Nigerian kids will not fit through. We use the Kencove brand, but I recommend Starkline more. Premier 1 is also a good option. They have 42" and 48" chicken nets. If your goats are not prone to jumping, you might get away with the 42".