His Buddy is a 1919 American short silent Western film directed by George Holt and featuring Hoot Gibson. Peter Bogdanovich writes that the title was originally The Fighting Brothers; the copyright is registered under that name.
This plot synopsis comes from the original Library of Congress copyright filing. Note that the film's title and some of the characters changed.
Synopsis and review, The Moving Picture World, June 7, 1919: Synopsis from Peter Bogdanovich's book on John Ford: