Ordinance amending Article 1 of the San Francisco Health Code by: adding Section 43, to define pit bull and to create a procedure for determining breed; adding Section 43.1, to require every pit bull in the City and County of San Francisco to be spayed or neutered unless one of the enumerated exceptions apply; adding Section 43.2, to establish fines of $100 to $1000 for failing to spay or neuter, to limit an owner from redeeming an impounded unspayed or unneutered pit bull, to provide a procedur