Jill is very excited because tonight her two best friends, Meg and Annie, are coming to spend the night at her farm for a Pony Scout sleepover. The girls get to meet the horses they will ride the next day. One of the horses is new to the farm, Rosy. Rosy is a little on the chubby side. That night the girls can't sleep so they sneak out to the barn to see the horses one more time. Surprise!