Barbie Horse Adventures: Wild Horse Rescue is a video game based on the Barbie line of dolls by Mattel.
A storm comes in and causes the gate at a ranch to open, letting horses and foals run away. Barbie must track down the foals and horses through 3 parts of 3 different settings: the forest, the mountains, and the beach. There is an average of three foals plus one horse that can be found at the end of the section. In the 2nd part of the section, a missing horse will be found by someone else, and Barbie must race them.
A sequel to Wild Horse Rescue was released on October 26, 2008. It was titled "Barbie Horse Adventures: Riding Camp".
Source: Wikipedia, "Barbie Horse Adventures: Wild Horse Rescue", available under the CC-BY-SA License.