Rabbit ownership laws in the US

Colorado
From Aurora, Colorado, local ordinances, '''Sec. 14-42. - Spay or neuter.''' (a) 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 of 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 of 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. (4) Intact animal license. An owner obtains an annual intact animal license and is in compliance with the city annual licensing requirements contained in this chapter. '''Sec. 14-161. - Excessive number prohibited.''' (a) It shall be unlawful for any person to keep or harbor more than three ferrets or two rabbits that are four months of age or older on any premises. Only one litter of offspring may be kept on the premises until the age of four months. (b) Exceptions. (1) Licensed kennels, pet shops and city shelters. (2) Any person providing records of ownership for excessive number of rabbits with the Aurora Animal Care Division within 30 days of the effective date [December 28, 2002] of this section shall not be subject to enforcement of subsection (a) for any rabbits existing at the time of the registration.

District of Columbia
From District of Columbia, § 8-1805. Impoundment. (a) The Mayor shall impound any dogs, cats, rabbits, or ferrets, the combination of which exceeds 4 animals, or any dogs, cats, rabbits, or ferrets beyond the number authorized in an animal hobby permit issued pursuant to § 8-1809.