On this thread:
http://www.yorkietalk.com/forums/sic...8-parvo-2.html livingdustmops states that
"People need to be aware there is a new strain of Parvo called Parvo 2 that is coming into the US via Mexico (they think). The normal shots will not cover this new strain. I am aware of this because of friend of mine took her dog to a Dallas dog park and almost lost her little girl due to this. Her dog is now into a study with Pfizer to help determine a new vaccine."
This is how vaccines are made, a dog with the illness develops antibodies, and these antibodies can be used in a vaccine. Vaccines have saved millions of lives, do research and find out why it's best not to "over vaccinate", but that is much safer than not vaccinating at all. When you research, please check your sources, if the website is selling you a product find a source that isn't.