WormXPlus flavored de-wormer chewables treat and prevent roundworms, hookworms, and the two most common forms of tapeworm. Worm X Plus Small Dog chewable contains 30 mg pyrantel pamoate and 30 mg prazilquantel. WormX Plus Large Dog chewable contains 114 mg pyrantel pamoate and 114 mg prazilquantel.