You run out of the room and find yourself in the middle of a long, dark hallway. You sprint down it eagerly. You're so happy. So happy, in fact... you stop dead in your tracks at the entrance to the hallway. You look down and see that your tongue is longer and more flat then you remember it... in fact, it's hanging out of your mouth a few inches as you breathe in quick, rapid breaths. You realize something with shocking horror: you're panting. You bring your hands up to your face and feel around your nose and mouth. Your nose feels a little moist and rough, but still retains it's shape... somewhat. You run your fingers along your teeth and find them a little sharp. Your face has definitely pushed out, bur very little, a half an inch at most. You feel something brush against your thighs, and look back around to see your tail has lengthened considerable, to the point it's almost grown in.
You yelp out in shock at the changes, and clap a hand to your mouth when you realize how dog-like you sounded. It appears the abuse you suffered from the girl is slowly turning you into a pitbull. Whimpering, you rush down the hallway to the right and find a set of steps leading downward. You sprint down them eagerly, barely noticing your tail wagging happily behind you. As you run down another flight, your face pushes out another half-inch and your spine has started to shorten. You reach the bottom just as you start to feel your chest and stomach bulging as huge, powerful muscles grow in. You throw open the first door you see and find to your relief a garage. There's a green sedan parked in the single-car slot. You reach your rapidly shortening and fattening fingers to the opener just as you feel claws push out of the ends of your fingers.
The door opens slowly and lazily. You watch with bated breath (your face pushing out another inch) as it finishes opening. You un rapidly around the car and fumble with the door handle for a minute, considering your hands could now be considered more paw-like than hand-like. You finally pull it open and jump into the front seat, tail wrapping around your expanding, muscular rear. By some miracle the keys are in the ignition. You manage to turn the Keyes and the car starts lazily to life. You try to grip the steering wheel as best you can with your almost completely paws, and you somehow manage to back the car out of the garage.
You look in the rearview mirror and see the top of your head, where your ears have moved and grown pointy, before flopping over slightly and growing black fur on them. You slam on the brakes in horror as you see another girl in a skimpy leather outfit and black choker necklace rising from the back seat, holding another whip. "BAD boy." She scolds, before wrapping the whip around the seat headrest, looping it around your neck. She puts her high-heel clad foot on the back of the seat and pulls hard backwards.
The whip cuts into your neck, and for just one moment, you can't breathe. You whine out in pain and try to bring your paws up to pull the whip away, but your now hugely muscular arms (front legs?) seem to be stuck out in front of you. Try as you might, you can't move them up. Suddenly, without warning, your neck expands considerably, becoming hugely muscular and pushing your head out further. Your muzzle pushes out completely as your teeth sharpen, becoming pointy and your long tongue flops out of your mouth. You slide down in your seat as your spine shortens more and cracks, forcing you to now walk in quadrupedal position. Your feet extend and shorten into huge paws. Your thighs and butt bulge with muscle rapidly as they shorten. Your hips merge with your rear as they push out. Your dick lengthens and is zipped up like a zipper up, attaching itself to your stomach in a furry sheath. You shrink a little and you feel your body bulk up, becoming very stocky and muscular. The girl finally lets go of the whip as it wraps itself around your neck and thickens, becoming a leather collar.
The girl gets out of the car and opens the driver door and drags you out, throwing you, a huge, muscular black and white pitbull, out of the car. You stumble and roll on the ground, whimpering, not accustomed to walking on four legs yet. She clips a leash around your collar and leads you back to the house as you half walk/are dragged to the front door. "You've been a VERY bad boy." The girl shakes her head and clicks her tongue. "But I guess you can't be punished anymore, we've robbed you of your human life... well, let's see what Madame Perro has to say about this..." You submit and follow her along, panting, into the house.