I will opt out of your question and maybe another expert can assist you.
I was asked if I could further assist you. It is true since we cannot do a fecal examination on your Golden I cannot tell you exactly what the parasite is, but I would like to give you a site that has pictures (warning some graphic pictures) that will help identify the parasites you are dealing with. Once identified there are some sites like Fostersmith.com, or 1800petmeds, that sells parasite control medications that do not need a prescription that may aid you in treating your boy. The site to help you identify the parasites is: http://www.thepetcenter.com/exa/worms.html If you discover the parasite is a tape worm you will not only have to address the parasite, but also the cause which is the ingestion of a Flea that was carrying the tape worm eggs.
http://www.marvistavet.com/html/body_tapeworm.html Tape worm info
http://www.marvistavet.com/html/roundworms_in_dogs___puppies.html Round Worm info
Tape worm treatment from www.1800-petmeds http://www.1800petmeds.com/productpress.jsp?id=62&adate=04.08.2008
http://www.drsfostersmith.com/product/pet_supplies.cfm?c=3307+8 Non Prescription wormers and they have an 800 number where you can speak to someone at Drs.Foster and Smith for help with choosing the proper wormer for the Dog once parasite is identified. Joan