Sorry for all the questions! I recently got 2 pigs, a day apart but came from the same pen etc. They took to eachother very well. I'm so in love with them and their personalities I want to get another one! (We've just gotten to all clear for no pregnancy) is 3 pigs too many? I'd have to buy a new cage, what sizes are good for 3? Also, introductions, is it likely to affect their friendship introducing another one? Thank you