My Uncle raised pigs for a while. I don't remember much because I was still pretty young, but I do remember this: DO NOT TRUST A PIG.

Ever.

Pigs can be evil like you wouldn't believe. Wolves on the hoof. They will eat ANYTHING that gets in their pen. If you have beasties that are used to roaming free on acreage, I'd put the pig's pen inside a second pen to keep everything else out.

Pigs are delicious. Dangerous, but it sounds like there's lots of good advice on this thread.