There is no city ordinance requiring that pets be licensed. However, there is an ordinance that requires pets to have up-to-date indentification on them. This could be accomplished by a variety of means, including microchip, rabies tag, store-bought ID tag, or an ID plate on a collar. Some of these are more reliable than others. A combination of two or more is best to ensure your pet can be returned to you if it were to go missing.