Werewolves are pretty common stuff in literature. Even then, there’s a lot of variety–from the enormous monster wolves, actual wolf-sized wolves, and the wolfman.
Some authors stretch the possibilities more. Werecats are popular, too (usually tigers, leopard, panthers, or lions, but I once read a book with were-house-cats). I’ve also read about werehyenas, wererats (horribly terrifying because they were human sized. Yeesh), werefoxes, and weresnakes…
Which means, I think, you can pretty nearly be a were-anything.
What kind of werecreature would you like to read about? (Leaving the mythical creatures out. Though a weredragon would be awesome.) If someone leaves a comment that inspires me, I’ll write you a story.
If no one does, I’ll write you a story anyway. No telling what kind of creature I’ll come up with, though.
NOTE: Spell check is okay with werewolves, but surprisingly close-minded about any other kind of shapeshifter.