Westerns used to use trip wires on the horses which wasn't good, the most notable being Stagecoach (1939).
These days thy use trained horse and CGI, always look for the disclaimer at the end of the film, it either says "no animals were harmed" etc or "the animals welfare was looked after", the latter's style is obviously avoiding the former's outright statement.
In a time of universal deceit - telling the truth is a revolutionary act. George Orwell
When the debate is lost, slander becomes the tool of the loser. Socrates