The Devil and Ms. D (1999)

Psychiatrist Cora is in a professional crisis, two of her patients have succumbed to each other. Stanislaus Nagy appears in her practice, a strange young man possessed by Maria Callas. But Cora has anything but a harmless Callas admirer. The man suddenly claims to be the bodily devil and, hidden inside his poodle, has directed the life of the opera dives. Nagy also gains a strange power over Cora's fate.