Alvin does that and he is gelded, but very studdy....I don't know if they gelded him late or that's just how he is, but when someone else has been in his field he immediately checks the "piles." Upon sniffing he pins his ears, arches his neck and squeals....strikes out, rears up....all of that good stuff.
Maybe he pissed he missed the party?
Have you read the article Fly man it is really interesting this guys perceptions. I would love to read everything the guy puts out their Im notorious for watching horses harness or Tbreds at the track but Im always looking threw the binockers at their damn hooves and watching how they travel in the front end and where the hoooves are hitting landing hools stiffles knees insane i know.
I wish I could spend a wk just listening to this guy who writes that stuff.