It is interesting to explore different perspectives, and to understand the reasons that the differences exist :) I suspect that the answer to the question about how many litters is enough will depend on the bitch but perhaps even more on the goals of the breeder and his/her tolerance for risk.
I do wonder about the impact of multiple pregnancies. Does anyone have any data/knowledge about the general impact of multiple pregnancies on the body? Vilma -- anything to say about multiple close pregnancies in women?? Mary-Ann Bowman Utah