Can I add other wolves I find to my pack if I already have a mate?

Now I'm not one hundred percent sure, but I highly doubt you can. From my own experience, the only wolves around are potential mates and once you have your mate the game no longer has any other wolves hanging about (at least for me). But even if there are other wolves still hanging around I do not think its possible to add them to your pack, as the goal of the game is to grow a family.