Effective dog dewormers include broad-spectrum options like Panacur C (fenbendazole) for tapeworms, roundworms, hookworms, and whipworms, and Drontal Plus or PetArmor 7 Way. For routine prevention, monthly chewables like Trifexis or Simparica Trio treat worms and fleas/ticks, while puppies require a regular schedule starting at 2 months