He didn't go out last night and was pretty achey from our ride, so Megen (my coach) gave him Advil. I got on G today and while I had no stirrups and was trying to do stretches, he bolted. Afterward he was a bit hardmouthed and ignoring my commands a lot, but nothing serious. A little later I asked him to canter, and he took off, going REALLY, REALLY fast, and then swerved and I fell off. This was my fault (the fall), as I was leaning forward, but he was still having issues. I got back on and jumped him, and he was okay.
I got off and another girl, Emily, got on. As soon as she asked him to go to the rail he bolted and started spooking at EVERYTHING. He was so jumpy we had to get her another pony to ride. O.O
Info that might help:
Gonzo is normally spooky, but has been getting over his fears. He was a rescue so you never know. It might just be that he's very comfortable with me and not as much with Emily, but he was jumpy when I rode him, too.
Could this have been the advil? What other things do you think it might've been?