The Sussex Spaniel is known primarily by its official registered name, which derives directly from its county of origin in southern England. Unlike many breeds that have accumulated numerous nicknames over the centuries, the Sussex Spaniel has remained remarkably consistent in its nomenclature, reflecting both its distinct identity and relatively limited distribution throughout history. The breed is sometimes affectionately referred to simply as the Sussex by enthusiasts and breed club members who have dedicated themselves to preserving this rare and venerable spaniel.
In historical texts and early breed documentation, the Sussex Spaniel was occasionally referenced as the Sussex County Spaniel or the Rosehill Spaniel, the latter name acknowledging the famous estate where Augustus Elliott Fuller developed and refined the breed during the late eighteenth and early nineteenth centuries. The Rosehill designation, while not commonly used today, represents an important piece of the breed's heritage and is recognized by historians studying the development of British spaniel breeds.
The breed has earned the distinction of being called the longest and lowest of the spaniel breeds, a descriptive phrase that captures the Sussex Spaniel's unique rectangular silhouette and distinguishes it from its taller spaniel cousins. This physical description has become so associated with the breed that it serves almost as an alternate identifier among sporting dog enthusiasts. The Westminster Kennel Club has described the Sussex as possessing striking characteristics including its massive head and bone, long body, strong short legs, and a rolling gait that is unlike any other spaniel breed.
Among breed fanciers, the Sussex Spaniel is celebrated as one of the rarest purebred dogs in existence, a distinction that carries both pride and concern within the breed community. The Sussex Spaniel Club of America notes that there are only approximately six hundred Sussex Spaniels in the United States, making encounters with this breed a genuinely special occurrence. This rarity has led some to describe the Sussex as a living piece of canine history, a breed that represents the traditional English sporting spaniel in its most preserved form.
The breed's recognition extends across all major international kennel clubs, establishing its legitimacy and importance within the purebred dog world. The Sussex Spaniel holds the notable distinction of being among the first breeds recognized by multiple kennel clubs, including both the Kennel Club of Great Britain in 1872 and the American Kennel Club in 1884. This early recognition speaks to the breed's established identity and the consistency of its type even in the formative years of organized dog breeding and exhibition.

