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This could be hooks, whips or roundworms. Hooks and rounds are the more common ones. The good news is that they are all treated the same. You can use Pyrantel or Fenbendazole (Panacur) to treat all of these worms.
I usually go with a 3 day course of Panacur and then I'll repeat it in 2-3 weeks. I would take a stool sample to your vet and make sure there are not other parasites. Then treat accordingly.
I hope this helps, let me know if you have any other questions.