As long as your doe isn't unusually small, pygmy to nigi would not be an issue since they are both mini breeds
I completely agree.I wouldn't say pygmies are smaller. I have had pygmies and nigerians, but not at the same time. The pygmies might be slightly shorter than most of my nigerians, but they were much wider, stockier, and heavy-boned. There shouldn't be a problem crossing the two, although I'm not sure why you'd want to.