Which breed is characterized by a prime example of various distinguishing features such as spots and mottling?

The Appaloosa breed is well-known for its distinctive coat patterns that include spots and mottling, which are defining characteristics of this breed. The unique color and patterns are due to a specific gene associated with the Appaloosa breed, making them easily recognizable among horse breeds. Additionally, Appaloosas often have a white sclera around their eyes, striped hooves, and a naturally high level of endurance, which appeals to various equestrian disciplines.

Thoroughbreds, on the other hand, are primarily recognized for their athleticism, speed, and sleek build rather than their coat patterns. Arabians are famous for their endurance and impressive bone structure but do not typically exhibit the spotted coats that define the Appaloosa. Mustangs are known for their wild heritage and adaptability but lack the distinctive mottled or spotted coat patterns characteristic of Appaloosas. Thus, the unique features of the Appaloosa breed make it the correct answer in this context.