Missing information from Deep Breath (TV story).
These omissions are so great that the article's factual accuracy has been compromised. Check out the discussion page and revision history for further clues about what needs to be updated in this article.
"Horse" was the name the Eleventh Doctor gave to the language supposedly spoken by horses. After carrying on a seemingly one-sided conversation with a horse the Preacher called Joshua, the Doctor claimed the beast preferred the name "Susan". He later appeared to carry on a longer conversation with the horse. It is unclear whether such a language actually exists, or if this is just another of the Eleventh Doctor's signature eccentricities. (TV: A Town Called Mercy)
After escaping a horse possessed by a Cuculus, the Doctor criticized its bad language. (PROSE: Houdini and The Space Cuckoos)
Behind the scenes
The Doctor's ability to speak with horses is a riff on his series 6-introduced power to speak "baby".