Marnie goes to ride Forio for the first time in the film; the trainer complains that Forio tried to bite him earlier.

Forio represents Marnie's concept of freedom, and Hitchcock codes Forio accordingly. Indeed, the similarities between the horse's biting motion and Marnie's castration-through-robbery motion invite immediate speculation about the horse's role as Marnie's free compatriot. Nonetheless, Forio represents only an illusory freedom: both Hitchcock and Herrmann code the horse with elements of fantasy and falsitude. The metaphor of the wild horse invites ready comparison to the notion of taming as the morally appropriate course of action for a seasoned animal tamer such as Mark.