The only fence that will hold pigs, is one that can hold water. If water can get through a fence pigs will too, in about half the time it took the water to find a hole.
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I had sows, kept them in the barn yard. Had a woven wire fence , with 2 electric wires on inside. Pigs are very smart, once they get a shock , they stay put. Give them a wallow hole and a bit of mud in it , they are happy. old243
We do NOT want them in Ontario