No person may operate a riding school or commercial stable without first having obtained a riding school and stable license as provided herein. This Section shall not apply to any private stable wherein the owner houses or stables only his own horses. The annual fee for a riding school and stable license shall be as follows: (1) School or stable authorized to house or display less than ten (10) horses $50.00 (2) School or stable authorized to house or display ten (10) but less than twenty (20) horses $100.00 (3) School or stable authorized to house or display twenty (20) or more horses $150.00