New York Consolidated Laws, Public Health Law - PBH § 2141. Compulsory vaccination

(a) that is transported through the state and remains in the state fifteen days or fewer;

(b) confined to the premises of an incorporated society devoted to the care of lost, stray or homeless animals;

(c) for which vaccination against rabies would adversely affect the animal's health, as determined by a licensed veterinarian;  or

(d) confined for the purposes of research to the premises of a college or other educational or research institution.

3. (a) Every veterinarian providing treatment to a dog, cat or domesticated ferret shall verify, in accordance with standards established by the commissioner, if such animal is actively immunized against rabies or is exempt under subdivision two of this section.  If active immunization or exemption cannot be verified, the veterinarian shall immunize the animal at the owner's request.

(b) If the animal is exempt from the provisions of subdivision one of this section, pursuant to paragraph (c) of subdivision two of this section, the veterinarian shall provide the owner of the dog, cat or domesticated ferret with a certified statement verifying that the animal is exempt from immunization because the immunization would adversely affect the health of the animal, and verifying the nature and duration of such exemption.  The certified statement shall be in a form prescribed by the commissioner and shall be consistent with the requirements of section one hundred nine of the agriculture and markets law.  Medical exemptions are to be renewed on an annual basis.