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Thank you for using Just Answer. My name is Rebecca; I am a veterinarian. Please give me a moment to type my answer.
I am sorry you are concerned about your Golden Retriever.I see she has been wormed, but no one wormer gets all parasites and not all parasites are worms. Has a stool sample been examined microscopically to be sure she is free of parasites?
You can try giving her probiotics, beneficial bacteria supplements. I like Fortiflora and Proviable, which are made just for dogs.
Giardia is hard to pick up even just looking at a stool sample but if a sample is sent to a lab it can be tested for.
You could try treating for Giardia with a course of fenbendazole or metronidazole. These are by prescription so you would have to get them from your veterinarian.
I would do that, or try a course of treatment for Giardia if that is suspected, and/or try the probiotics.
Thank you for the great rating.
Please let me know how she is doing.