Hi Gramps,
I'm in agreement with your vet. If you do not notice a significant change after taking the higher dose, I'd quit wasting the money, too. I would, however, give it a good 6 week run, though.
Do you have areas of inflammation? You might consider using anti-inflammatory meds (aspirin, motrin, ibuprofen, NOT tylenol) to augment the glucosamine, if so. Sometimes joint inflammation can block the action of the glucosamine.
I'm not a Dr., though I am licensed to administer meds, and cannot (and wouldn't, anyway) prescribe meds. I would surely speak with your primary care provider before upping your dose and/or adding anti-inflammatories.
Since you mentioned the vet, I have a question. Do you use the same grade (brand and/or quality) glucosamine the vet uses? I know it is available in big tubs at a MUCH lower cost than we humans pay for our little bottles. I've been trying to determine what is different about the quality of it, but so far, no one has been able to say.
Good luck!
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Copper
Let Miracles Replace all Grievances
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Mega doses of glucosamine? 
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