About 13-14 years ago I had a female potbelly. She was by far the smartest animal I've ever owned. She was a house pig. Litter box trained and all. A word of advice. If you don't want your pig to know how to get into something, like plastic feed containers, don't ever let it see how you got into it. They will remember and help themselves.
We would tether her in various spots in the yard and didn't have a problem with dandelions or cutworms. If you want to have a miniature pig (meaning not big like a standard pig), ration its food and don't give it too many treats.
Pigs sunburn very easily. They don't have much in the way of fur. That's why pigs wallow. They are only trying to protect their delicate skin. Their skin will also chap and crack. Think of chapped lips, but all over your body.
You have to trim their hooves. If you don't it will cause their knees to bend backwards which isn't very good for supporting their dense weight.
Research whether or not you want to have their eye teeth removed as piglets. When they become adults they turn into tucks that stick out the sides of their mouths. Adults can sometimes be temperamental and stubborn. If they get annoyed they are known to swing the side of their faces at you and slice your lower leg open.
Pigs are social animals and need companionship 24/7. If you were only going to get 1 and have it living outside without other peaceful animals as companions, then rethink it.
I have pics, but they're buried in a box somewhere. I miss my pigs. She was awesome. They're not like having a dog. Continue researching before you decide.
Oh, one more thing. Pigs remember people, so warn people not to tease them.