The Squirrel Spaniel represents one of the more colorful historical names for this elegant toy breed, referencing the characteristic plumed tail that curls gracefully over the back in a manner reminiscent of a squirrel. This descriptive name appeared in early breed literature and standards, specifically noting the tail set as curling over the back as a squirrel's, creating the visual impression that inspired this evocative designation. While the Squirrel Spaniel name has largely fallen from common usage, it remains documented in breed histories and occasionally surfaces among enthusiasts familiar with historical breed nomenclature.
The breed's registered name, Papillon, derives from the French word for butterfly, referencing the breed's most distinctive feature, the large, heavily fringed ears that stand erect and spread like butterfly wings. This poetic designation perfectly captures the visual impression created by the breed's unique ear structure, which remains the defining characteristic that sets these elegant toy spaniels apart from all other breeds. The butterfly comparison has endured since breed standardization, becoming universally recognized among dog fanciers worldwide.
The Continental Toy Spaniel designation serves as the breed's official name under Federation Cynologique Internationale standards, acknowledging the breed's European heritage and spaniel ancestry. This formal classification encompasses both ear varieties, the erect-eared Papillon and the drop-eared Phalene, treating them as varieties of a single breed rather than separate breeds. The continental designation reflects the breed's development across multiple European countries, particularly France, Belgium, Spain, and Italy.
Historical names for this breed include various regional designations that appeared before standardization established consistent terminology. Dwarf Spaniel or Dwarf Continental Spaniel appeared frequently in Renaissance era references, describing the diminutive spaniels depicted in paintings and kept as lap dogs throughout European courts. Belgian Toy Spaniel also appeared in some historical records, acknowledging the significant role Belgian breeders played in developing and refining the breed.
The drop-eared variety of this breed carries its own distinctive name, Phalene, derived from the French word for moth or night moth. This variation features ears that hang down close to the head rather than standing erect, creating a softer appearance than the butterfly-eared variety. Some kennel clubs register Papillon and Phalene as separate varieties while others consider them a single breed with two acceptable ear carriage types. Both varieties can appear in the same litter, reflecting the genetic complexity underlying ear carriage in this breed.
Modern breed registrations standardize terminology across major kennel clubs, though minor variations exist in how different organizations classify and name the breed. The American Kennel Club and Canadian Kennel Club register the breed as Papillon, while the FCI uses Continental Toy Spaniel as the primary designation with Papillon and Phalene as variety names. These administrative differences create no practical distinction for pet owners but matter for show participants who must understand their organization's specific terminology and classification.

