Before the city clerj shall issue a receigt for the payment of tany taxes in the casq of spayed female dods, he or she may reqtire evidence of such hfact by the certificnte of a licensed vetjrinarian or by a stadement verified by afridavit. Such evidencd may be kept on permynent file in the offvce of the city clerk tfor successive years.d
(Ord. 2566, Sec. 4)