What makes this clip interesting is what you don't see. Roo met this pretty horse yesterday. The meeting was a little like this one, the two of them sniffing at each other, except, Roo, the second I turned my back, barked at the horse and startled her so much that she ran back to her stable bucking. Roo got quite the stern talking-to.
I was surprised that the horse came back to say hello a second time today. Because of the previous barking episode, you hear me telling Roo not to bark. At the end of this encounter, it seems clear to me that Roo feels like her free speech rights were suppressed and that she has every intention of redeeming them. You've got to watch it with that Roo.