Welp, apparently when I 'idly browse' for something I end up buying it. Which has resulted in a puppy and now indeed a miniature horse. To add to the other three ponies.
He doesn't arrive for a couple of weeks as he's currently a stallion (gulp!) and we're having him gelded their end, which they have been great about.
But any advice from other mini owners? How much to I need to ramp up my electric fencing?! 
Obligatory pic!