One dose of Drontal will wipe out tape worms. My dog had them. My vet didn't even need to see a stool sample. Drontal kills all types, but the white rice looking ones are definitely tape worms. They are one of the few worms that can be seen without a microscope.
Natty Boh 6-27-12
Annie 1998 - 8-2-12 RIP