Legion is a Screen Actors Guild (SAG) production, and therefore it was required to provide an American Humane Association Animal Safety Representative™ on-set access whenever animals were used. However, due to late notification and scheduling conflicts, American Humane's Film & Television Unit was unable to supervise the scenes in which animals appeared. Screen Gems did provide information on the animals and a pre-release screening of the film, but since American Humane could not witness the animal action firsthand, the film has received a Not Monitored rating.