The miniature donkey traces its ancestry to the small donkeys native to the Mediterranean islands of Sicily and Sardinia. These diminutive equines evolved over centuries in the rocky, arid terrain of the islands, where their compact size and exceptional sure-footedness made them ideally suited to narrow mountain paths and terraced hillside farms. Natural selection on these relatively isolated islands favored smaller animals that required less food and water while still being strong enough to carry loads and turn grinding stones.
The breed's formal introduction to the United States came in 1929, when Robert Green of New Jersey imported a small group of Sardinian donkeys. Green recognized their potential as companion animals and began a modest breeding program that would lay the foundation for the American miniature donkey population. His efforts were bolstered by subsequent imports throughout the 1930s and 1940s, gradually building a genetically diverse foundation herd on American soil.
Over the following decades, selective breeding refined the miniature donkey into the animal recognized today. Breeders focused on maintaining the gentle temperament and compact frame while improving overall conformation and health. The establishment of a breed registry helped standardize characteristics, setting the upper height limit at 36 inches at the withers. This careful stewardship transformed the miniature donkey from an obscure island working animal into one of the most sought-after small equines in North America.
The genetic heritage of the miniature donkey remains a subject of interest among breeders and researchers. DNA studies have confirmed the close relationship between modern miniature donkeys and the ancestral populations still found on Sicily and Sardinia. Conservation efforts in Italy have worked to preserve the remaining island donkeys, many of which share direct lineage with the animals that were exported to the Americas nearly a century ago.