So my pig lives in an open cage and he stands and points his nose up to see me when I walk near him. He leans over the edge and noses my nose and it's really sweet. Sometimes when he wants to be held, he'll even start crawling out onto my shoulder. Sometimes he nibbles a lot. But today he was pushing himself onto me like he wanted to be held (I wasn't holding him though; I was resting my hand on the side of his cage because he was nosing it) and then he bit my finger so hard! I had to wash all of the blood off. I don't understand why. He isn't hungry; he had food and water and timothy hay. My fingers didn't smell like any food because I hadn't been eating prior to that. Was he moody? I want him to be happy and I don't understand what could be wrong. I've had him for over a month now and he's never drawn blood before or been aggressive. He is a really happy and well-adjusted pig.