Hubby bought the GoatVac CD/T vaccine made by Colorado Serum Company. As far as I know, none of our goats have ever received this vaccine. We know to inject 2ml/cc. What is the best location to inject? Any tips? The bottle says to repeat the dose in 3-4 weeks. My question is that our older pygmy mix may be about 55 days bred. Will it hurt her to give her a third dose 30 days before kidding . . . or should I just hold off on giving her the first dose until 2 months before kidding?