Conn. Gen. Stat. § 22-339c
Certificate of rabies vaccination.
(b) The owner or keeper of a dog or cat shall keep a certificate, or copy thereof, stating that such dog or cat has been vaccinated against rabies and shall make such certificate or copy available to any animal control officer, regional animal control officer or municipal animal control officer of any municipality for inspection.
(c) An antirabies clinic, upon request of any municipal animal control officer or animal control officer, shall submit to such officer a copy of any such certificate issued. Such copy shall be used by the officer to search for unlicensed dogs in accordance with the provisions of section 22-349 .