I might have mentioned before that, unlike a human foetus, which is usually only one by itself in the womb surrounded by its own thin covering membrane (the amniotic sac), the each of the several puppies in a bitch’s womb is surrounded by its own enveloping bag.
When each pup is born, its surrounding sac is ruptured and the puppy is set free to breathe on its own. If this does not occur,
