A. A letter of exemption from vaccination may be submitted for licensure, if a medical reason exists that precludes the vaccination of the dog. Qualifying letters must be in the form of a written statement, signed by a licensed veterinarian, that includes a description of the dog, and the medical reason that precludes vaccination. If the medical reason is temporary, the letter shall indicate a time of expiration of the exemption.B. A dog exempted under the provisions of paragraph 5 A, above, shall be considered unvaccinated, for the purposes of 10-144 C.M.R. Ch.251, Section 7(B)(1), (Rules Governing Rabies Management) in the case of said dog's exposure to a confirmed or suspect rabid animal.10- 144 C.M.R. ch. 260, § 5