Vaccinations should be given every 2-4 weeks (preferably 3-4 weeks) until 16 weeks minimum (preferably 18 weeks). What's done is done and nothing can be changed now.
It was probably not the healthiest thing to do, but many people (breeders and vets) do it and it works out fine.
I really would hope the breeder used a good vaccine though. Some are better than others and some of the ones sold at farm supply stores are just not good (less effective).
__________________ Crystal  , Ellie May (RIP)  , Rylee Finnegan  , and Gracie Boo🐶 |