Of course, ye olde werewolf has been around for ages. I recently read Anne Rice's latest, The Wolf Gift, in it she references a bunch of wolf related novels. You may or may not have heard of these.
*The Wolf Leader by Alexandre Dumas. I've actually read this one. A man sells his soul for the vengeful powers of a wolf. This one is based on the folklore tale Dumas heard from a family friend when he was a boy. Project Gutenberg doesn't have it but I did find it online for free. It's not the easiest read because of the typos.
*The Man-Wolf by Erckmann-Chartrain (also The Count of Nideck adapted by Ralph Browning Fiske). A short story of a Black Forest monster, The Man-Wolf was created by the French duo Erckmann- Chartrain. The link goes to an English version of the story. I'm not sure about the adaption by Friske. I can't find much about it, other than it's illustrated.
*Wagner the Wehrwolf by George W M Reynolds. This one sounds really terrible! It's a penny dreadful and even the description on Goodreads is flowery. Wagner gives the last year of his life to a guy named John Faust for wealth and youth. Of course, he has to become a werewolf to get it. Should be interesting.
*Vandover and the Brute by Frank Norris. As far as I can tell, there are no werewolves in this one. Darnit. Vandover is a young artist in San Francisco who does a lot of drugs in seedy bars. This bad side of his personality is referred to as 'a wolf.' Boo.
Other werewolf stories I ran across while researching this post that you'd might like:
*Were-wolf by Clemence Housman. This one involves a lady werewolf. Housman was a suffragette. HP Lovecraft had this to say, "attains a high degree of gruesome tension and achieves to some extent the atmosphere of authentic folklore." This could be interesting.
*The Werewolf by Eugene Field. This is actually a short story within a collection of Eugene Field's work called Second Book of Tales linked here. Field was a children's author.
*The Book of Were-wolves by Sabine Baring-Gould. If you really want to know about the myths and legends of the werewolf, this vicar (yes, vicar) and historian who taught classes with a bat on his shoulder wrote quite the tome on them. Not on Project Gutenberg but scanned onto Sacred Texts (a website). I think I'll skip this one.
Have you read any of these? Are they worth reading?