We have written a few times about this in the past few years.
Please do take note: https://www.facebook.com/doctor.karen.becker/videos/1469701116438099/
Please do a Google search on “over vaccination” and do give serious thought to research findings.
http://www.dogsnaturallymagazine.com/dangerous-over-vaccination-on-the-rise/
What are titers: http://www.dogsnaturallymagazine.com/titers-avoiding-over-vaccination-in-dogs/