I am still searching for studies, etc. on the topic, but just to add in my own two cents, I have read and heard that tiny moms have many risks. If the puppies grow too big, "they can plug the birth canal and an emergency trip to the vet is necessary for her to survive, let alone the pups." There are just too many risks. Her uterus can be ruptured. A C-section is almost always needed. There are still risks when breeding a bigger female, but there are sooo many more risks when breeding a tiny. I am not saying that every tiny bitch has pregnancy problems, but I am saying that there is a bigger probability that a tiny bitch will come across some sort of pregnancy complication.
These are just several things that can happen with any dog's pregnancy that tinies are more susceptible to:
-The puppies are too large for the female. She never goes into labor, the puppies die and she becomes infected by the decaying bodies.
-A puppy gets stuck. Neither your female nor you can get it out. You have to race her to the vet. The vet can't get it out either. She has to have an emergency caesarian section |