This chapter examines Charlotte Perkins Gilman’s “The Yellow Wallpaper” as a werewolf narrative with metonymic connections between transformation, madness and the moon. It argues that the narrator’s metamorphosis is triggered by the moon, becoming wolf-like in a rebellion against her husband-cum-doctor’s prescription of the rest cure. The analysis traces werewolf intertextuality, showing how film adaptations of “The Yellow Wallpaper” (1989 and 2021) remediate its lupine qualities. Deleuze and Guattari’s theory of “becoming-animal” is used to show the emancipatory nature of the narrator’s metamorphosis into a restless, wolf-like creature, while also asserting that the narrator imagines a community of were-women that inspires collective action. This becoming-multiple is interpreted as analogous to nineteenth-century feminist groups, such as suffragettes or New Women. The analysis also considers how the story troubles oppressive binaries and hierarchies, demonstrating multiple methods of breaking-free. The narrator’s transformation is understood through Gilman’s biography and politics, including a brief discussion of a later story, “When I was a Witch”. The chapter concludes that “The Yellow Wallpaper” appropriates werewolf intertextuality, or becoming-animal, as a metaphor for personal and collective transformation.