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Canine Whelping Signs. Within the 24 hours before labor begins, the mucus plug that covers and protects the cervical canal releases. The American Kennel Club website warns that the mucus release isn't very noticeable. More reliable indicators include restlessness and neediness in the expectant mother.
Answer by Ali41 (1593) The mucus plug begins to form as soon as the blastocyst (very young embryo) has successfully implanted. This is roughly five days following fertilization of the egg with a sperm.