Squeaking and rumbling is good. Yawning is actually more a defensive gesture that translates as "stay away from me". it is often used when you are a afraid of the other piggy/piggies. I hope that they will get to settle down together eventually. if you decide to separate, I would leave them so that they can interact through the bars and can get to know each other better in the meantime.
What is your other boy called? I like Dapple though; it is a new name for the forum!
What is your other boy called? I like Dapple though; it is a new name for the forum!