"Hmm, what about an Appaloosa?" Sarah said with a smile, she had always liked the patterns to the Appaloosa coats.
"Very good, we've only got a few Appaloosa horses nearby and we could always use more mares," the scientist said and picked out a syringe and nodded to the mirror against the wall. "Are you ready?"
"Yeah, I'm ready," Sarah said as she held her arm out and flinched a little when she was injected with the transformation serum. The scientist stepped back and gave her a smile.
"Don't worry, you'll do just fine, we'll make sure you're comfortable," she said.
Sarah nodded and looked back at her reflection as if waiting for something to happen. It started with the fur covering her body, it began as white and then black spots started to appear. Her hair grew out down her neck as white streaks appeared in it. Her chest barreled out as her arms and legs stretched out to form into her legs.
Her nipples migrated down to her stomach and formed into her new horse udder. Her ears migrated to the top of her head and became pointed as her face pushed out into a muzzle and her eyes and teeth changed to that of a horse. Her lower body shifted and ballooned out into a horse's rear and she turned around briefly to see her vagina forming into a perfect mare's vagina as a tail formed over it that she swished.
"Wow, you look great," the scientist said as she patted Sarah's nose. "And you're a Leopard Appaloosa mare, perfect, we don't have any of those nearby. We still have a few more horses coming in today, so I'll take you outside."
The scientist put a bridle on Sarah's muzzle and lead her outside to an area where the animals were being kept as they were getting ready to be taken to wherever they would wind up. The scientist walked off and left Sarah there to graze.