Susan (A Town Called Mercy)

Susan, known to the Preacher as Joshua, was the Preacher's horse in Mercy, Nevada in 1870. According to the Eleventh Doctor, she preferred the name "Susan" and wanted the Preacher to respect her life choices. The Doctor rode Susan to find Kahler-Jex' ship. (TV: A Town Called Mercy)

Personality
Susan was a mild mannered horse but she tended to swear. Only the Eleventh Doctor knew this, however. (TV: A Town Called Mercy)