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>When the bitch becomes pregnant the hormones that she releases stimulates the roundworm larvae, which can be lying dormant in the tissues. Some will go to the uterus and into the developing puppies, some will go to the mammary glands and be passed to the puppies through the milk and others will stay in the intestine. Pregnant dogs should be treated for worms while pregnant and while feeding the puppies, also the puppies should be treated every few weeks in their own right.
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