C.R.S. § 12-315-117

A licensed veterinarian who in good faith administers emergency care or treatment, or euthanasia for humane reasons, to an animal, without compensation, either voluntarily or at the request of a state or local governmental officer or employee, is not liable for civil damages for good-faith acts in the administration of the care or treatment. This immunity does not apply in the event of a wanton or reckless disregard of the rights of the owner of the animal.