Yes, that is The Doctor riding a horse. It seems the seventh season of "Doctor Who" will take Amy, Rory, and The Doctor to the old west.
We haven't quite worked out the kinks of mounted combat on this horse-lizard planet.
After being turned into a tiger-human hybrid, what else is there to do but fight a horse for his SCUBA equipment?
Animal fact: when threatened by dinosaurs, horses will perform a complex ballet number, usually something from "Swan Lake," to defend themselves.
If it weren't for my horse...
Well, I'm certainly not opening that door.
I've never seen someone so confused by a horse.