The transformation process is harrowing for the lycanthrope and incredibly disturbing to any witnesses. The eyes change first, the whites darkening and the iris filling with color. The claws go next; the hands elongate, knifelike claws extend from the fingertips, and the thumb forms a claw back near the wrist. The muzzle thrusts forward out of the human's skull, and the teeth jut through the gums in sharp points. Bones crack as they rearrange. Marrow spills into the bloodstream as ribs and skull fracture and telescope. Thick, wiry fur pushes through the skin, often pushing out normal human hair. The tailbone elongates and becomes a shaggy wolf's tail. Metabolism speeds up, increasing blood flow, oxygen flow, and glandular production, creating cravings for protein and fat. Any clothing that was worn at the time of the change is generally torn to shreds and falls away. If a werewolf dies in beast form, it changes back to human form, a process called death reversion.

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PLANESWALKER'S GUIDE TO INNISTRAD: KESSIG AND WEREWOLVES