A.k.a. La Lupa Mannara.
Starring: Annik Borel, Dagmar Lassander, Howard Ross, Tino Carraro and Salvatore Billa.
On the night of a full moon a beautiful young girl starts a rhythmic ritualistic dance into a circle of fire. Her pure skin and lovely features assume the ugliness of a wild animal. She dreams she is a werewolf and proceeds to have sex with men before ripping their throats out.