We have a round bay pin that is made out of 5'x20' cattle pannels... the 4"x4" squares. T-posts to hold it up and like a 4' gate outlined in pipe that you walk through to get in. Its probably around 120' diameter. Has brush and a water line that trickles into a hole to make kind of a waller. It has a little lane with a square pin that is around 8'x10' so we can seperate hogs and only work the ones we wants (or let pups bark from the outside. Big hogs older dogs... small hogs for younger dogs.
Buddy has one that is like 1.5-2ac and they used King Ranch wire and just built it like a normal pasture fence. They can make holes but very few have actually gotten out because of the size. Has water holes, brush, good practice pen.
The smaller you go, more confined the hogs, the stronger it has to be.
Don't use chain link...
... learned that the hard way.
