Size
Maximum height of 36" at the withers measured at 3 years has already been established by the Miniature Donkey Registry. A minimum height of 30" is strongly recommended by NMDA.
While most of an individual's mature height is attained during its first year, an individual is not considered mature in height and strength of bone until three years.
Rationale:
A minimum height has not yet been determined, but a recommendation has been made to prevent loss of potential reproductive fitness including foaling difficulties. Small size may also adversely effect conformation and balance.