U need to buy jacks bible. Nemex is good for rounds. But you started worming way too late. Plus the way you are working them is just making the worms resistant. The DIRECTIONS are important. Rounds have a 14 day cycle. So it only males sense to worm them at two week intervals. It makes no sense to do it 4 days in a row. That's how you use panacur, not Nemex (strongid). THERE IS A LOT TO BE SAID FOR READ ING AND FOLLOWING DIRECTIONS! On a last note, worming them at 6 weeks old is just asking for trouble. I personally worm with strongid t at 3, 5, and 7 weeks. Then a week later 3 days in a row of panacur for safe measure. At 10 weeks 1/4 cc ivermectin under the skin. You need to worm all puppies, regardless of whether you see the worms or not.