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Sexual intercourse between a dog (male) and a bitch (female) transfers the male's sperm to the female's vagina. The sperm travel through the uterus and fertilize the female's eggs. The eggs implant in the wall of the uterus and an umbilicus forms which allows oxygen and nutrients to transfer from mother to puppy and waste products to travel from puppy to mother during the puppies' development. Once the puppies are fully developed contractions of the mother's uterus expel the puppies.

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