I recommend that you ask what is in the vaccine that is being given your pet. I have also found that package inserts are not complete. In an effort to investigate the ingredients in certain rabies vaccines, I found that the package insert only listed gentamycin as a preservative. When I contacted the company asking about any other ingredients, I was sent the MSDS (material safety and data sheet ) that report the presence of neomycin(another antibiotic) and thimerosal. You can ask to see the MSDS sheets or find them your self online if you know the brand of vaccine that is to be used on your pet.
Remember – vaccines are not benign, and can cause reactions including skin disease, vomiting and diarrhea, autoimmune disease, seizures and cancer. You have the right to be informed and deserve full disclosure of what your pet is receiving.