Will Falconer, DVM Moderator
Hi Gretchen, and welcome.
You've done some great things for Duke and drawing blood doesn't hurt any animal. Like in humans, it's what we do with the results that matters. (Ah, I see another blog subject forming in my mind...)
You may be up against that wall that I see regularly in homeopathic practice: diet can only go so far in curing chronic problems.
While I would never NOT recommend balanced raw diets (meat is not balanced, alone, btw), I see them improve their health to a point, and then treatment is needed to get all the way to "cured."
In my hands, that's homeopathy. Others may use acupuncture, herbs, etc.
So, don't stop what you are doing, but consider finding a trained holistic vet to work with to help Duke get the rest of the way to your goal: fully, shiningly healthy. Vital.