Just a few minutes ago I had to deal with this yet again!
They were in the barn, trying to tear open cardboard boxes.
(They just LOVE cardboard for some reason!)
I presume you have a salt block for them? And of course, those little critters can smell the foliage that went into making that cardboard, and you goats will eat nearly anything and everything. Around these parts we have Kudzu. Goats are the cure for Kudzu.