Yeah, I dunno, I've seen a lot of burros and this was pretty far off the beaten path. It was a major surprise for us that this burro hated dogs. OTOH I've seen a lot of horses and dogs working together (hunting, say?) and never seen anything negative happen. Why would burros be any different? So maybe it had been harassed. Given it's aggressiveness (literally a few feet from us) it would be a really bad idea for a dog to screw with it.
