The Mulefoot pig derives its name from the breed's unique physical characteristic: solid, non-cloven hooves resembling those of mules rather than the split hooves universal in all other pig breeds. This distinctive trait - caused by a simple genetic mutation affecting hoof development - creates the single most defining characteristic that immediately identifies Mulefoot pigs. The name directly and accurately describes this unusual feature, making the breed unmistakable even to those unfamiliar with rare pig genetics.
Historically, these pigs were sometimes called "mule-footed hogs" in older agricultural texts and farm records, though "Mulefoot" without the hyphen has become the standardized modern usage. Some early references mention them simply as "solid-hoofed swine" or "single-hoofed hogs," describing their distinctive characteristic without using the breed name. However, these descriptive terms fell from common use as "Mulefoot" became universally recognized as the proper breed designation. No regional or alternate names exist in modern usage - the breed is simply known as Mulefoot across all areas where these rare pigs are raised.
The breed's exact origins remain somewhat mysterious despite their American development, with solid documentation lacking for their early history. Mulefoot pigs appeared in various locations across the American Midwest - particularly Missouri, Iowa, Indiana, and Ohio - during the late 1800s and early 1900s, with farmers noting the unusual solid-hoofed pigs appearing in their herds. Whether these represented spontaneous mutations, importation of unique genetics, or descent from earlier solid-hoofed pigs remains debated among livestock historians. Some theories suggest Spanish colonial pigs may have carried the solid hoof trait, with occasional expression creating the foundation for Mulefoot development.
Regardless of uncertain origins, American farmers recognized and valued the solid hoof characteristic, selectively breeding Mulefoot pigs and forming breed associations in the early 1900s. The National Mulefoot Hog Record Association was established in 1908 in Indianapolis, Indiana, to maintain registry records and promote the breed. At their peak popularity in the 1910s-1920s, Mulefoot pigs numbered in the thousands across the Midwest, valued for their reputed resistance to hoof diseases and their excellent meat quality. However, the breed experienced severe decline as industrial agriculture favored specialized commercial breeds, nearly disappearing by the 1970s when fewer than 100 purebred Mulefoot remained. Conservation efforts beginning in the 1990s have slowly rebuilt population numbers, though the breed remains critically endangered with The Livestock Conservancy listing them as "Critical" - their most endangered category.

