My mini is in with three goats. He LOVES them. Ultimately he rules the roost there, but he has one who he hangs out with quite often. The goat will scratch him where he needs scratching, and lay at his feet when they're standing out there. My mini was not introduced to goats until he was 5. He and "his" goat will run around and play with each other, eat together, sleep together... (the goats are pygmies), he also has some "horse" company in my older 14 hh mare....but he chooses his goat. If I take one out, the other calls for him. So it's obvious they are bonded. They are all grained separately just so they don't have to share. The goats have toys out there they can jump on but the mini can't...although I think he'd like to! It would depend, I would think, on the mini and the goat. I really believe goats need more of their kind more than horses do in most respects. So I'd probably be more worried about the goat. But, again, they're all individuals...just telling you how things work around here!
Angie