How long into pregnancy can a mother dog be dewormed?

Generally, deworming is not recommended during a mother dog’s pregnancy; the owner should ideally deworm her before pregnancy. But if the dog accidentally gets internal parasites during pregnancy, deworming can still be done, using safer deworming medicine and preferably under a veterinarian’s guidance to avoid harming the mother and fetuses.

The owner should ideally deworm the mother dog 1-2 weeks before mating to prevent parasite infection during pregnancy.