What does my puppy's very first vaccine protect them against?

Question

what does the first vaccine in a dog actually does? what is its work? Pet's info: Dog | German Shepherd | Male | unneutered | 2 months and 6 days old | 4 lbs

Andrea M. Brodie, DVM · Accepted Answer

The first vaccine at 6 to 8 weeks of age protects the puppy from parvo in case it has no maternal antibodies left. If it has maternal antibodies left in its system, the vaccine will not do anything, however we cannot know whether there are any left or not. So it is a "just in case" protective vaccine.

What does my puppy's very first vaccine protect them against?

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