It had been three months since that fateful day when Nancy had climbed inside of that box. Three months since she started training as a pony with her friend Stefanie. They had gotten good at it.

They weren't the only girls living like this. Three more girls had arrived after they had. However, they seemed to have been trained already. They were well toned and obedient. It seemed they where sent away while their owner was out of town.

At first, Nancy could barely stand in these high heel pony boots, now she could effortlessly run in them.

At first, it was hard to run alongside Stefanie, now they always seemed to know what the other was about to do.

The two naked girls stood next to a post, a tether leading to each of their clit rings, preventing any movement from that spot.

Master walked up to them and pet them. Nancy had never gotten the bearded man's name, but in time she learned to call him Master. "You two fillies are doing great. You have come so far in such a short amount of time. Now we must put that to the test."

Nancy wondered about that. "Test, what test? Will we get candy afterwards? I hope so." She smiled behind her bit gag.

A car drove up to the field pulling a horse trailer behind it. A red haired man stepped out of the car and walked over to them. "I see you have some nice fillies. Are they your yearlings?"

Master turned to look at the man. "Yes they are. I trust those are your yearlings?" He looked back at the trailer.

"Yes, they are." A pair of tan girls with raven ponytails stepped out of the trailer and where lead by another man. Both where about the same height and cup size.

Instead of leather, the women wore latex. Purple latex boots with metal hooves, purple and black corsets, purple arm sleeves, and purple hoods. The hoods covered everything other then a hole for the mouth and nose and another hole for their ponytails. Their breasts where completely bare other than the nipple rings. Like the other girls, a metal bit gag was locked in their mouths.

The two women where soon hitched to a cart similar to the one Nancy and Stefanie pulled. They were then led by their nose rings to the race track. It seemed these two women where completely dependent on someone to guide them as they didn't move when not detected to.

"Your new girls look fast."

"So do yours. Care to make this race interesting with a wager?" The red haired man smiled.

Nancy didn't hear the next part as her trainer led them to their cart and then the track. They stood next to the latex-clad girls and waited.

Soon, she felt someone grab the reins. Nancy stood ready. When the bell rang, the reins cracked and all four girls started running. Based on the weight, it seemed Master was driving today.