You want to keep two goats on how many acres? Don't think they can eat that much brush and make a difference!
Picture a tree or bush full of goats....when they are done you are left with naked broken limbs
but the plant survives.
We have eight goats and ten kids and this is their destruction. Pic was taken yesterday.
This bush has been attacked by goats for eight years.
The goats will need shelter. They are not the kind of animal that you put out there and forget.
I think it's great that you want to get some goats. Yes they can help keep down some of the brambles and brush but they don't "clear" the land. Not when you own only two.
I can't help you with the question of the best guardian for your goats as I don't use one.
May your troubles be less, Your blessings be more,
and nothing but happiness come through your barn door.