I would think if you kept your goats and/or pig in their own secure pen or corral, it would be more a matter of your dogs knowing their boundaries. I've seen those kinds of animals do really well with other species, but, I've also seen some that don't even tolerate their own kind. But, I've never personally owned farm animals, although I want to some day! There are people here that do, though. You should post this question in pet general, too, though, if you haven't already. You'll get more exposure if you ask in both places. What's your border collie's name? Juno's a cool name!