St. Peters, MO Animal Ordinances: Mandatory Spay/Neuter (2026)

Two separate provisions drive spay/neuter obligations in St. Peters, and neither applies to an ordinary pet that has never been adopted from a shelter or declared dangerous. Section 205.170(A) requires that provisions be made for the sterilization of any dog, cat or other domestic animal released for adoption or purchased from a public or private animal shelter, or an animal control agency operated by a Humane Society or by a County, City or other political subdivision; the adoption fee itself covers the cost of microchipping along with other adoption charges, and the Health Manager can deny an adoption proposal outright, whether or not the applicant already lives in St.

Peters. Separately, Section 205.250(A)(3)(b) lets the Health Manager return a dangerous animal to its owner instead of euthanizing it, but only if the owner accepts a list of conditions, one of which, Subsection (5), requires the animal be spayed or neutered at the owner's expense within thirty days of the dangerous declaration. That sits alongside an orange collar, microchip, secure confinement, a four-foot muzzle-leash outdoors, and $500,000 in liability insurance, and Subsection (8) makes failing any one of those conditions, including the spay/neuter deadline, an unlawful act subject to seizure. There is no general citywide ordinance requiring spay or neuter of animals outside these two triggers.