Suddenly you catch a scent, which your new nose and brain identify as a rabbit. At that moment, you realize you are hungry. Fortunately, you are downwind of the creature, and you find yourself moving very, very quietly towards where your sensitive ears hear the quiet munching of grass. Your body seems to be moving at the command of instincts you have just now acquired. You leap.
Your sharp teeth seize the rabbit by the neck, and you kill it by breaking its neck with a quick shake. The raw bloody meat tastes wonderful, far better than anything you remember as a human. You even crunch the bones for the marrow, and your long, flexible tongue licks up the blood spilled on the ground.
You don't feel human anymore.