In the mid-20th century, the population began to decline, and by 1964, one breeder, R.M. Holiday of Louisiana, Missouri, established what would become the last herd of purebred Mulefoot hogs.
During the middle of the 20th century, the pig population began to decrease, and by 1964, a single breeder in Louisiana, Missouri, founded what would eventually become the last remaining herd of unadulterated Mulefoot hogs.