No person shall conduct or operate within the city any commercial breeding or boarding kennel or cattery, commercial aviary, pet shop, grooming parlor, commercial stable, riding academy, pony ride, guard dog and/or sentry dog service, zoo, animal menagerie, animal exhibition, circus, miscellaneous animal reptile establishment, or operate as an animal dealer, without first obtaining a license from the animal control officer. For the purpose of this section, guard dog and/or sentry dog services located outside the city but providing service within the city on a regular basis shall be included. "Regular basis" shall mean more than five times per year. (Ord. 912, § 2, 1988.)