I got home to find my two donkeys had escaped their stall. Somehow, they got into the main section of the barn, and had gorged themselves on Hay. For those who know equines, this is bad. For those who don't, there's an interesting bit on colic here and on laminitis here.
To make a long story (and a $200 emergency vet call) short, we still don't know how they got out. The door was closed and latched. The fence was uncompromised for the entire length of the pasture, and the walls to the stall are nearly 40" high (the donkeys are only 30" high). I raised the walls another foot with some scraps of lumber to keep them in for good. They're off pasture for a whole week: doctor's orders. We'll be watching them through the night, and if they're OK then we wait more. If they gorged on grass (and not hay) the full symptoms of the undue stomach fermentation will show as damage to the hooves (really). We have no way of knowing, so we have to wait and see.
I will not be sleeping tonight.