Vandover and the Brute - Frank Norris

Vandover is a student who succumbs to a gambling addiction. This addiction causes him to divest himself of his cherished possessions and to lose his status in life, whilst his friends prosper. Eventually he is transformed by a strange degenerative lycanthropy, reduced to running back and forth across his apartment, naked, on all-fours. The novel was Norris' first, though published posthumously. Characteristically, it explores the themes of habit and addiction in a heightened "naturalistic" style. (Summary by Sprocket)