Colorado Code § 35-80-106.4

Sterilization of ownerless dogs and cats required - rules - exceptions - violations
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(1) An animal shelter or pet animal rescue shall not release a dog or cat to a
prospective owner unless the animal has been sterilized by a licensed veterinarian.
(2) If a licensed veterinarian declares in writing that a sterilization procedure could
jeopardize the life of the dog or cat, the procedure may be delayed until such time that a
veterinarian determines that the dog or cat is fit to undergo the sterilization procedure. At such
time, the prospective owner shall have the animal sterilized. If the determination of unfitness for
sterilization has been made prior to release, the animal shelter or pet animal rescue may release
the dog or cat to the prospective owner, subject to this subsection (2).
(2.3) (a) For an animal born in Colorado, if a licensed veterinarian declares in writing
that a sterilization procedure could jeopardize the health of the dog or cat, the procedure may be
delayed until such time that a veterinarian determines that the dog or cat is fit to undergo the
sterilization procedure. At such time, the prospective owner shall have the animal sterilized. If
the determination of unfitness for sterilization has been made prior to release, the animal shelter
or pet animal rescue may release the dog or cat to the prospective owner, subject to the
provisions of this subsection (2.3).
(b) If a veterinarian licensed in Colorado declares in writing that a sterilization
procedure is likely to cause a secondary illness, injury, impairment, or physical condition that
involves inpatient care or ongoing outpatient treatment, the procedure may be delayed until such
time that a veterinarian determines that the dog or cat is fit to undergo the sterilization
procedure. If the determination of unfitness for sterilization due to jeopardizing the health of the
animal has been made prior to release, the animal shelter or pet animal rescue may release the
dog or cat to the prospective owner, subject to this subsection (2.3)(b).
(2.5) For the purposes of the exemptions in subsections (2) and (2.3) of this section:
(a) A veterinarian shall base a determination of unfitness on specific details regarding
the specific animal for which an exemption is requested and shall not include multiple animal
exemption requests in one determination.
(b) The commissioner may submit a signed complaint to the state board of veterinary
medicine if the commissioner has reason to believe that a veterinarian's written declaration
submitted pursuant to subsection (2) or (2.3) of this section is in violation of section 12-315-112.
(c) At the time of license renewal, each animal shelter or pet animal rescue shall provide
the department with information regarding animals exempted pursuant to subsections (2) and
(2.3) of this section. The animal shelter or pet animal rescue shall provide the information in the
form provided by the department and shall include the breed, age, category of exemption,
reasoning for the exemption, and name and license number of the veterinarian licensed in
Colorado that made the exemption determination.
(3) This section does not apply to:
(a) The release of a dog or cat to a person with prior and continuing ownership rights to
the dog or cat who is reclaiming the animal from an animal shelter or pet animal rescue;
(b) The transfer of an animal from an animal shelter or pet animal rescue to another
animal shelter or pet animal rescue or to a veterinarian;
(c) Repealed.
(d) Public animal shelters eligible for waiver of licensing fees pursuant to rules
promulgated by the commissioner; or
(e) A facility in an area with limited access to licensed veterinarians that has been
granted an exemption by the commissioner; except that any animal shelter or pet animal rescue
that imports unsterilized dogs or cats into the state is ineligible for an exemption.
(4) Nothing in this section shall preclude a town, city, county, or city and county from
adopting, maintaining, or enforcing an ordinance that exceeds the minimum requirements
adopted by the commissioner in implementing and enforcing this section. Nothing in this section
shall preclude a licensed animal shelter, whether public or private, from adopting, maintaining,
or following a policy that exceeds the minimum requirements adopted by the commissioner in
implementing and enforcing this section.

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