The pain in your neck swells throughout your neck, head and shoulders. Your vision blurs. Your head throbs, and you stumble. The last thing you see is the ground rushing toward you very fast.
You wake. Your body aches, you must have hit the ground pretty hard. Your jaw throbs, you try to open it and realize that it is bound. You open your eyes, and blink. You're back in the stable with a tether going from the stall post to your bridle. You are a horse again. Daylight streams through the open stable door.
You look down at your hooved feet and realize that you were sleeping standing up. The stable is empty except for a couple of mares in heat. Something deep in you awakens and is aroused. Your enlarged organs become engorged. You feel your stallion's tool riding down your belly. All thoughts of your stolen humanity fade. You whinny, and struggle with your enclosure. You have to get to the females.
A chuckle from a man standing in the doorway draws your attention. You wonder when he came in. He looks familiar. Yes, that was it, the man from last night with the rifle. A twinge of pain in your neck reminds you of last night's events.
The man approaches your stall.