We HAD 2 pot bellied pigs in a welded wire fence pasture with our goat. Our female pig refused to stay in the pasture! She would just root under the fence. Good Luck.
Concrete? I haven't had any pigs, but I have heard they can go through just about anything. They just pick it up with their noses. I saw a nice enclosure not far from my house. The fence was hog panels. They had wooden posts on the corners and t-posts in the middle. They ran an electric wire inside the bottom of the fence. It seemed to work for them. They held 10 feeders in it for the summer. If I ever get pigs, I am going to build like this.