This past week my eldest piggy has been acting very aggressive towards my younger ones (even injuring the smallest foot). I have separated them until I get a bigger cage which is coming in the mail, but every time I get all 4 of my pigs in the playpen together he starts chattering his teeth at the others. I'm scared if I'm not there to control the situation a fight could break loose. He is 4 months old and I heard 4-14 months is a very hormonal time for them. Does this sound like just puberty? I have another one the same age and he doesn't cause any problems at all. If anyone has any tips to get them all to bond that would be great.