You know I have been doing more research into temperaments now that I'm having my own issues and it's plain in black and white. Temperaments are herditary. There's no ifs ands or buts about it. It doesn't necessarily have to be directly from the sire and dam either, it could be from some where down the line. While environment does play some part in the development of the puppy's temperament, it's more genetics than anything else.