Sean Ellis has stated that he also took from the story of the Beast of Gévaudin for inspiration to write this film.
Boyd Holbrook loved the script so much, he convinced Director Sean Ellis that he could successfully play a British character and he did.
Director Sean Ellis has said the inspiration for this film came from The Wolfman (1941) but decided to give it his own meaning at the same time. He has stated his meaning is a metaphor of a addiction in this story.
Originally called Eight for Silver
Related to the French film "Le Pacte des loups" or "The Brotherhood of the Wolf" (2001). That film takes place in Gévaudan, France, where the creature is supposed to be a giant wolf or werewolf as mentioned in Eight for Silver.