*shrugs* I use cattle panels for my Nigerian Dwarves, and they stay confined. Even the buck in rut stays put, despite the girls going into strong heats now. The key is not to put anything near the fence that they can JUMP over. All my toys for the goats are far from the fenceline. If they get a hoofhold, they'll launch over.
The young kids, until they are 3-4 months old, can squeeze through the cattle panel. But they like to keep close to their mothers, who are still behind the fencing, so they rarely do.