This photo needs its own post, so it shall have it.
Outlander on Instagram revealed this photo of Graham McTavish as Dougal upon a mighty steed. You can see Caitriona Balfe and Sam Heughan on a horse in the background also. It look like Caitriona is wearing a coat on her front and possibly Sam is as well. This looks to be from a scene between the cottage and Castle Leoch.
Look at all the crew gathered around to get the shot. Those horses do have to be well-trained.
Source: Outlander on Instagram