Well, it's nature, they have to have a social hierarchy... it's how their society is structured. The top pig gets everything first and best, but also has more of a 'job' to do (probably more evident in the wild or in a larger group where they have to keep the peace between varying members.) The bottom pig isn't the boss, but also doesn't have as many worries (they just do what the leader does.) I figure that some pigs may be overly bossy, but those would be the pigs whose herds ran like a well-oiled machine! I also saw how distressed Sundae was upon losing the leader pig when Linney passed away and realized that, as many times as she shoved Sundae out of the way, she was giving Sundae a very real sense of protection and comfort. I think it caused me to value that 'bossy pig' behavior more highly! They are the glue that sticks things together!