We have eight pigs and one of them just started acting all aggressive. I would say it's been happening for a week now. We did just add three, we had five. The aggressive pig was one of the original ones. He isn't hurting the others but I feel like he is "pushy" and he tries to show us who the boss is. I want to stop this now before it turns into injury to us or the other pigs. Any tips or thoughts on this?