The following letter is one used by a veterinarian in California and can be used as a sample to show to your own veterinarian when asking for any exemption from the rabies vaccine or any situation where your animal might be required to have a health certificate.
This letter is to verify my recommendation that this animal should not be given vaccinations due to the risk of creating or exacerbating illnesses in this animal. This animal is either a breed type or an individual who has a tendency to develop illness as the result of the immune system stress created by vaccination.
Recent studies have shown the relationship of routine vaccinations to many immune related diseases. Many immune system diseases such as allergic dermatitis, food allergies, autoimmune thyroiditis (hypothyroidism), decreased resistance to infections, blood dyscrasias, and general immune system suppression have been related to vaccination.
It is my opinion that the above-mentioned animal has a risk of illness if given vaccinations.