Born after approximately 63 days of gestation, puppies emerge in an amnion which is bitten off and eaten by the mother dog. Puppies begin to nurse almost immediately. If the litter exceeds six puppies, particularly if one or more are obvious runts, human intervention in hand-feeding the stronger puppies is necessary to ensure that the runts get proper nourishment and attention from the mother. As they reach one month of age, puppies are gradually weaned and begin to eat solid food. The mother may regurgitate partially digested food for the puppies or might let them eat some of her solid food. By the age of about seven weeks, puppies no longer depend on nursing for food. Although they may continue trying to nurse, the mother dog usually refuses after this age, though she might let them occasionally nurse for comfort.
Puppy. (2009, March 14). In Wikipedia, The Free Encyclopedia
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