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http://www.veterinarypartner.com/Content.plx?P=A&S=0&C=0&A=562Hello there, this is Dr Jess. I am sorry to hear about Bensons problems. It is possible what you are seeing in his stool is tapeworm segments, as these look like grains of white rice. The link above is an article about tapeworms.
The tapeworms don't usually cause any noticeable illness though, but other intestinal parasites can, so I would let your vet know about them and drop off a stool sample to check for other parasites. If he has been losing weight this is important to do. I would also recommend bloodwork to check for any underlying diseases. What are his symptoms right now?