Grimes ' other film credits include Cahill U.S. Marshal ( 1973 ) alongside John Wayne about a mule that kicks field goals .
John Wayne is the Spikes Gang ( 1974 ) with Lee Marvin and Ron Howard and the cult Disney film Gus ( 1976 ) .
Grimes ' other film credits include Cahill U.S. Marshal ( 1973 ) alongside John Wayne , The Spikes Gang ( 1974 ) with Lee Marvin and Ron Howard and the cult Disney film Gus ( 1976 ) , about a mule that kicks field goals .