My 2 piggies are in different cages. Should i leave them like that? or should i let them go under the introduction process. The first time i let them be together they started fighting. i never knew there was such think called the intro process until there were one. during this one year period, they bit there cages like maniacs taking the paint off the cage. trying to get to the other piggy. and they stopped trying to do that now but they haven't gone through the intro yet. they are sisters though. what should i do.