I feed raw and just love it. As far as him not liking it - you may want to try other flavors, what are you feeding right now?
And yes, I totally thaw mine - it would have much less flavor if still partly frozen. I usually take out about 4 days worth of raw, set it out to thaw on the counter, then keep it in tupperware in the fridge over the next 4 days. I have never heard of running it under hot water; while that will de-thaw it, I wouldn't totally recommend that as you might kill some natural enzymes (which you want to keep).
What symptoms are you seeing related to allergies? It may not be the food. But, if you are seeing allergies of any kind, you may want to add-in some other supplements to support optimal digestion and skin.
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