I do also remember reading that there certainly *IS* such thing as too much protein... just anecdotally, as a Vet Tech (I'll see if I can find any articles on it), high protein was always taken into account when it came to renal issues and Pano, among other things... Interestingly, a few years ago, there was quite a difference of opinion in "Senior" diet recipes - some insisted on lower protein due to it's affect on aging kidneys, stone formation, etc. - particularly in breeds prone to it like Dalmatians, where others promoted the idea of higher protein as older dogs have a tougher time assimilating protein (and their muscles get all stringy)...
And in the case of Dalmatians, for instance, Dal folks insist on low Protein diets as 100% of Dals have a uric acid production defect and protein in the diet ends up as sludge and then stones in the bladder. The lower the protein, the better, and most Dal folks I know prefer NON-ANIMAL protein sources, saying that in their experience, vegetarian diets seem to be better when it comes to the Uric Acid issue....
As an aside, the Dal folks DID introduce an English Pointer into select lines about 35 years ago (the Back Cross project) to introduce normal uric acid production genetics - they are not "recognized" by AKC even though they are 99.99% pure Dalmatian at this point - the purists consider them "mixes"... even though they are the only way to bring in the genetics to end the uric acid defect... talk about shooting yourself in the foot...
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