They're as intelligent as a dog and can be trained. As a child I became best buds with a big white pig at a home I was staying in. We were buds, I was around 5. I told him everything my little heart had. I woke up to a horrible screaming one morning, looked out the window just in time to see the machete coming down his belly--I screamed for 3 days. They had strung him up by his back legs and hoisted him up on a beam. Hated pork for years. Had to cook it with my 1st husband. And I did learn to eat it as I did once own a Mexican restaurant, but it was no hardship to give up when I went back to church.