The Master was not satisfied with his slave Susan. She was a lazy slut who wouldn't do her share of the chores. Maybe he thought she'd do better as a pet. They arrived at the ranch late one evening. Susan was collared and leashed. Pulling on her leash the rancher lowered Susan to all fours.

He asked her Master, "What type of pet do you want? We have fish, dogs, cats and horses." Susan's Master asked to see a dog.

The rancher called for Ginger. He was answered by a short slim blond who scampered to his side on all fours. "Watch her fetch," the rancher told Susan's Master as Ginger ran after a spiked ball The rancher had tossed.

Ginger brought the ball back in her mouth, the spikes sticking into her tongue and lips, drawing blood. Nuzzling up to the rancher's leg Ginger yelped for attention. "You're getting your blood on my pants," shouted the rancher as he booted her in her left tit. Ginger ran away to her dog house in the corner.

Susan's Master decided he wanted a pony to use on his estate. Since it was so late, the rancher led Susan to the stable. There she was put into a stall and securely chained.

In the morning Susan watched as the stable hands fed the other horses their oats. Then her turn came as the stable boy buckled a feed bag around her head and told Susan to eat her fill.

After munching on the dry cereal Susan was led from her stall to a water trough where she was watered.

The rancher entered the barn and led Susan out to a corral. There she was hung by her wrists from a hoist. The rancher ran his rough hands over her naked body tugging on her nipple and cunt rings.

When Susan cried out in pain, the rancher slapped her across her mouth telling her to make sounds only when asked to by a human. A cowboy brought a large box to where the rancher had Susan strung up.

From the box, the rancher took a harness that fit over Susan's body. Her breasts were outlined by straps that went around her chest above and below her tits. These straps were connected to two spiked rings that just fit around the base of her breasts. Any movement of her tits would pull them into the spikes.

A strap ran from between her breasts to Susan's waist, where another belt circled her body. From that belt a strap ran from front to rear across her cunt and asshole. Over Susan's pussy there was a large rubber band-like donut, over Susan's anus was poised a five inch thick rubber dildo with a plume of feathers on the end. A long strap ran from her waist belt up to Susan's collar.

Susan was released from the hoist and pushed to the ground. Using his riding crop across her back, the rancher instructed Susan to kneel with her ass in the air. It took ten good skin tearing strokes of the crop to get her in position.

Wiping the crop on her bleeding back, the rancher announced that Susan's conversion into a pony for her Master would begin. "First, you need a tail," the rancher told her as he plunged that thick unlubricated rubber cock up her ass. Susan cried out in pain as her anal tissues tore from the forced entry.

"You were told to remain silent," said the rancher as he pushed a cock-gag into Susan's mouth.

He gave a final shove on the dildo in Susan's ass as he locked it on to her ass-belt. This new pain caused Susan to bite down on the cock in her mouth. As she did, Susan felt a squirt of cum-like fluid on her tongue.

Opening her eyes she glanced down and saw a tag labeled "HORSE CUM" sticking out from between her lips. The rancher howled with laughter as a look of recognition came onto her face. "Horse cum for a filly," he chuckled. "Now that you've got a tail let's get you some shoes," the rancher told Susan as he led her on her hands and knees to a shoeing stand.

There Susan was hung at her waist so that her four limbs were dangling in the air. The rancher told Susan what was coming, "These shoes will have you walking on the balls of your feet."

He picked up her right leg and pushed her foot into the shoe. Next he took a handful of nails and hammered them into her heel from the bottom and the side. Then he lifted her foot up and rested it on his knee. Taking a power tacker and a hammer, the rancher drove the tacks into the sole of Susan's foot in the shape of a horseshoe. The rancher then moved to her left foot and repeated the process.

Finished with Susan's feet he moved to her hands. Taking her left hand, the rancher shoved it into a stiff leather mitten. Its shape held Susan's hand bent at the wrist. Pins pushed through her arms locked the glove in place. He finished her right hand and lowered Susan to the ground.

As she hit the dirt, Susan's hands felt the thumb tacks in the mittens drive into her flesh. Urged on by the liberal use of the rancher's crop, Susan began to learn to prance about on all fours. Yanking on her collar, the rancher stood her up on what he told Susan were now her rear legs. She could feel her blood oozing from the many spike wounds on her feet.

As she trotted around the corral, Susan could feel the nails and tacks sliding in and out of her rear hooves. Susan bit down once more on the cock in her mouth and realized she had finished her supply of horse cum.

Susan was adjusting to her new reality. Her conversion into a pony was well underway.