Appaloosa Plains is the neighborhood introduced with The Sims 3: Pets. The neighborhood was first mentioned as "a quiet country-side town with meadows and woods to explore." Appaloosa Plains in the past was a cowboy ranch town in the Midwest, on the edge of the highway. As time progressed, the town has degenerated into a bit of a neglected ghost town before finally turning into a large township.The town is named after the Appaloosa breed of horse.
Appaloosa Plains is centered around pets and pet-related activities, with most households owning at least one pet. The countryside theme of the neighborhood can be seen from the abundance of ranch-style houses with barns along with its hilltop, riverside location.