S.C. Code Ann. § 47-1-60: Cutting muscles of tails of horses, asses, mules, mares, or geldings prohibited.

Any person who (a) cuts the tissue or muscle of the tail of any horse, ass, mule, mare or gelding, or otherwise operates upon it in any manner for the purpose or with the effect of altering the natural carriage of the tail, except when such cutting or operation is necessary for the health or life of the animal, as certified to in writing by a licensed veterinarian, (b) causes, procures or knowingly permits such cutting or operation to be done or (c) assists in or is voluntarily present at such cutting or operation shall be guilty of a misdemeanor.

Any person convicted of violating any of the provisions of this section shall be fined not less than fifty nor more than one hundred dollars or imprisoned not less than fifteen nor more than thirty days.