I have a paddock that's shared with two mini horses, two mini donkeys and two pygmy goats. Goats are like donkeys, they like to have company of their own kind, so if you have room, I'd recommend getting two. Mine all get along very well together, unless the goats try to "throw their weight around" at feeding time, then one of my mini donkeys, Gracey, will chase them off. Herd dynamics, you know, she has to remind them she's bigger. But that happens very seldom, just as a reminder now and then when one of the goats decides to try to challenge her for a pile of hay. There's more piles of hay than animals, so they don't have to argue, but they occasionally do so anyway.... Gracey has been with a goat her whole life, none of the rest of them have been, but there was never any issue with introducing them. They all bed down for the night together, lounge in the sun together, and get along well. When I take one of the horses or donkeys away, the goats will call for them.....they know when something's different. The only extra work is, when I grain them, I have to either tie the goats up, or bring them out. The goats don't get grain, and that is the only time they will get pushy is when there is grain to be had. But of the 4 donkeys/horses in that paddock, only two of them get grain, so I just bring them out separately to grain them.
Angie