An annual dog license fee set by resolution of the City Council is imposed upon every dog four months and older which is kept in the City by any person who is an owner/guardian as defined in SMC 6.08.050. Such registration fee shall be reduced by at least 50 percent for spayed or neutered dogs and for dogs owned by persons 62 years of age or older, who furnish legal identification, if all other requirements for registration under this chapter are met. If a person 62 years or older is registering a neutered or spayed animal, then the fee shall be reduced 75 percent. The license fee is due and payable 30 days following the day upon which the dog is four months old, or 30 days following the day upon which the dog, if over the age of four months, is first owned by a resident of the City.