A. I'd love to know more about what tests have been run on your dog. Giardia can make them feel pretty sick, but I suspect there's more going on if appropriate treatment has been completed. Giardia is pretty easy to fix with the right treatment, which is either metronidazole or fenbendazole.
At this point unfortunately he needs more diagnostics - blood work and x-rays to start, to examine the organ function (kidneys, pancreas, and liver specifically) as well as to look for any abnormalities in the GI tract, like a blockage in the stomach or intestines. These cases can be difficult but keep looking - there's a reason. And if leptosporosis is a problem in your area (ask your vet) don't forget to consider that, as it can be difficult to diagnose and often produces signs similar to many other diseases.
If you want to consult further about this I can likely help more by knowing some specifics.
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