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Any puppies that are still inside may be in danger if labor is prolonged. In cases like these, we have to ask what the priority is- i.e. mom's health or live puppies? If mom is more important, then medical management can be tried to help her deliver the puppies but the delay in the puppies being born may result in stillbirth. If a litter of live puppies is the priority (i.e. the breeding is a valuable one for protecting the line) then getting her to surgery for a c-section sooner rather than later is the best recommendation. If she continues to have puppies normally then let her have them but watch closely for trouble. Puppies should be no more than about 1-2 hours apart and a puppy should be produced for each hour of hard labor and active contractions. If she is contracting for longer than an hour or it has been longer than an hour between puppies, I recommend taking her to the nearest emergency facility for intervention. Additionally, each puppy should have a placenta and if there is a puppy without a placenta, then she should be treated for a retained placenta.
If you know how many puppies she is expecting and she appear to be having them normally then you can count the placentas and make sure there is one per puppy. As long as all of the puppies and placentas have been delivered then you can let her nurse them normally. If you do not know how many puppies she has in her then I recommend taking her to an emergency facility to have X-rays to look for other puppies that may be left inside. Depending on how she is doing you will have to decide about taking her to surgery or trying medical intervention.