Aurora, CO Animal Ordinances: Mandatory Spay/Neuter (2026)

Spay or neuter required. It shall be unlawful to own, possess or keep in the city any dog, rabbit, or cat over the age of six months that has not been spayed or neutered, except as provided in subsection (b) of this section.

(b) Exceptions. The following are exceptions to the spay or neuter requirements in subsection (a) of this section:

(1) Medical. A licensed veterinarian has determined that an animal is medically unsuited to undergo the surgical procedure. A signed statement from a licensed veterinarian is required and shall state specifically the medical grounds for the exemption.

(2) Temporary medical. When the animal's medical condition is temporary in nature, the licensed veterinarian shall sign a written statement as to the prognosis and when the surgery may be performed. The date given on that prognosis shall become the expiration date of the temporary medical exemption. After the period of the temporary medical exemption, spay or neuter shall be required unless a licensed veterinarian provides another temporary medical exemption and prognosis and when the surgery may be performed.

(3) Transitory status. An animal which is temporarily in the city. When an animal is temporarily in the city for breeding purposes, the owner of such animal is required to have and present, when requested, a certificate of health signed by a licensed veterinarian.