Yeah, quite possible. But, the slowfeeder net has much smaller openings, 2" diameter max, so, unless you have a tiny mini foal, horse can't get stuck. Shod horse can get hung up, tho. That's why I mentioned the more than knee height container for the net.
Mine have 1 inch holes. And if you hang it up properly there really is no way for a horse to get their big hoof through that and stuck. Unless they are super super tiny. And that would still have to be SUPER tiny