(Farnam) D-Worm Combo Broad Spectrum De-Wormer protects your dog against tapeworms, roundworms and hookworms. D-Worm Combo contains pyrantel pamoate and praziquantel to kill and prevent 7 species of worms, without a prescription. Liver flavored chewable tablets. Large dog dosage: 25-50 lbs. - 1 tablet; 50-100 lbs. - 2 tablets; 100-150 lbs. - 3 tablets; 150-200 lbs. - 4 tablets.