How do Arabian horses differ from Belgian horses and Thoroughbreds?

Arabian horses, Belgian horses, and Thoroughbreds represent distinct categories of horse breeds, differing primarily in their physical characteristics, historical development, and intended use.12

Arabian Horses

The Arabian is considered the oldest recognized breed and is classified as a light horse. It is a compact, spirited animal known for its stamina, intelligence, and beauty. Physically, it is distinguished by a uniquely concave (dished) head profile, large eyes, and a high tail carriage. Notably, Arabians often possess only 23 vertebrae, whereas most other breeds have 24.2345

Belgian Horses

In contrast, the Belgian is a heavy, or draft, breed developed for pulling heavy loads and farm work. These horses are broad and powerful, with a small, square head and a massive build. Unlike the light, agile Arabian, the Belgian is characterized by its strength and calm temperament.261

Thoroughbreds

The Thoroughbred is an intermediate, light breed developed in England primarily for racing. While they share ancestry with Arab and Barb horses, they were selectively bred for speed and stamina. They are taller and more fine-boned than Arabians, featuring long, sloping shoulders and a deep chest designed for a long, easy stride.157