I don't know of many novels on the topic, but The Werewolf of Paris by Guy Endore is certainly the best I've read. Rather than focus entirely on the usual terrorized villages, Endore instead takes us inside the life of the werewolf, Bertrand Calliet, who's been outcast due to his lycanthropy. We're taken across a wonderfully varied number of situations, and there's a magnificently realized psychological aspect that's unique for this kind of story. Gruesome, funny, sad, satirical... It's really just a fantasic book (and fairly short, at just over 200 pages).