The city says if it were to allow an individual like Ms Prinzivalli toobtain a new birth certificate with the different sex, it would be "knowingly issuing a false public record".
The obligation would fall on owners toobtain a vet's certificate proving that the animal had received anti-rabies jabs and had been treated to remove parasites.
And in 2010, the US State Department issued new guidelines requiring only "appropriate clinical treatment" toobtain a new passport or a birth certificate for US citizens born outside the country.
In 2011 the Transgender Law Center successfully pushed for passage of legislation ending surgery as a requirement toobtain a new birth certificate in California.