I would be getting a second opinion regarding spay vs. pregnancy with this large father and possibly larger still dogs in his background that could produce a huge puppy. Very risky for a 4 lb. female to have ANY pups, even those of a smaller line than her own, and this poor girl is carrying pups from a dog more than twice her size and who knows what size his grandfather/mother were!
__________________  Jeanie and Tibbe One must do the best one can. You may get some marks for a very imperfect answer: you will certainly get none for leaving the question alone. C. S. Lewis |