To put it bluntly it would effect the health of the dog in exactly the same way it would effect the health of a human women who gave birth to 5 babies every 3 months. Think about it humanely. It isn't fair on the dog.
stay with the mother and then when the puppies get older the dad teaches them, but later on in life the dad will mate with any female puppies to keep their genes in the family. also the father will...
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