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If the worms look like grains of rice, it's probably not roundworms. It sounds more like tapeworms and they come from the puppy ingesting fleas.The only way to get rid of tapeworms is to get a medication from your vet. Just give them a call and describe the worm to them. They will usually dispense it over the phone and let you come and pick it up. The medication will be either Drontal Plus or Droncit. One pill is all it takes and then the vet may have you repeat it later.
Let me know if you still have questions.
You will see them around the anus whenever there is an infestation whether you treat or not. They will look like grains of white rice or they might look like sesame seeds if they have died.
Fenbendazole is for controlling roundworms, whipworms, etc but it does not effectively control all tapeworms. Fenbendazole is effective against Taenia tapeworms...just not Dipylidium. Unless you know which one your pet has, you're better off to treat with the Panacur and Drontal.
You need to get some Drontal or Droncit from your vet. You can usually do so without taking the dog in. Just give them a call and describe the worm to them. The cost is usually minimal.