Can you worm a nursing cat?

Yes a nursing female dog can be dewormed and should be dewormed. You can either take her into the Veterinarian along with a small sample of her feces to check for parasites or use a dewormer such as Nemex-2 or find the generic version of Nemex-2. It will get all roundworms & hookworms. A female can pass on internal parasites to her pups while they are in utero (still inside of her while she was pregnant). Most pups do have round worms and should be dewormed at 3-4 weeks of age, again at 6 weeks and a final one at 8 weeks. Do at least 2 wormings, 2 weeks apart, to get all the adults and then the baby round worms. Worm the Mother dog twice also, 10-14 days apart. You will have to weigh her to get an accurate weight, don't just guess. Weigh each pup too. Read the label of any dewormer you are going to use and make sure it says, safe for lactating or nursing dogs.