Following County of Los Angeles v. Superior Court (2012) 209 Cal.App.4th 543, this decision holds that a county does not owe any mandatory duty to prosecute a dog as dangerous or a nuisance or confine it to investigate whether it has rabies–after it has bitten one human.  Hence, the next person bit by the dog cannot recover from the county under Gov. Code 815.6 for breach of a mandatory duty.