What are the early stages of dog pregnancy?
Weeks 1-2: Pre-implantation stage
* Sperm fertilizes the egg in the fallopian tubes.
* The fertilized egg travels to the uterus.
* The fertilized egg implants in the uterine wall.
* The embryo begins to develop.
* The corpus luteum, a gland that forms on the ovary after ovulation, produces progesterone, a hormone that helps maintain pregnancy.
Weeks 3-4: Embryonic stage
* The embryo's major organs begin to develop.
* The embryo is about the size of a grain of rice.
* The heart, brain, and other major organs begin to develop.
* The tail begins to grow.
* The eyelids and ears begin to form.
Weeks 5-8: Fetal stage
* The fetus is about the size of a grape.
* The fetus is fully formed and begins to move around.
* The fur begins to grow.
* The claws and teeth begin to develop.
* The sex organs begin to develop.
Weeks 9-12: Pregnancy
* The fetus is about the size of a golf ball.
* The fetus is fully developed and ready to be born.
* The mammary glands begin to produce milk.
* The bitch's abdomen begins to swell.
* The bitch may begin to show signs of nesting.
Weeks 13-14: Labor
* The bitch's water breaks.
* The bitch begins to push.
* The puppies are born.
* The bitch nurses the puppies.
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