Everyone who has watched a movie in the past century has likely heard of the phrase "No Animals Were Harmed." The simple sentence is a disclaimer attached to the end credits of most major motion pictures in America. Any movie with that tag is always certified by the American Humane Association to ensure that no furry friends suffer to make a film possible. It's a widely-known part of movies, but many might not know the history of that quote and that the horror genre played a role in enforcing it.
Source：https://www.cbr.com/horror-animal-safety-history/
