It's weird, I've never experienced this one either. I've never had a mini get loose. Usually when I see people complaining minis get out it's situations where they have fencing that's totally unsuitable for the horse. Of course it's gonna get out if presented with fence boards further apart than the mini is tall, but the minis test my fences far less than the taller horses/ponies did who could reach their heads over and strain against the boards to graze. Since the minis can't get their heads over they leave my fences alone. But all too often I've seen people with fences like this who are surprised when the mini escapes... (board fell down and was back up 5 min after this pic lol) I've also noticed a steady decrease in dwarfism lately. It seems like 10 years ago a good 50% of the minis I saw locally were dwarves and now it's genuinely rare I see one. Just buy a real registered mini from a breeder and it's unlikely to have dwarfism these days.