There are various views and diet stragedies amongst those the feed raw some will add rice , oatmeal, barley, sweet potato etc to there dogs diets
This study will prove most interesting, an experiment was done feeding dogs who already have reduced renal function, various amounts of protein over a period of time some groups as much as 4 years, Some of the study groups was being fed 44% protein some 14% others as low as 7%
Quote:
One group was fed a low protein diet, and the other
group received a high protein diet for the subsequent four years.12
Results of this study indicated that there were no adverse effects
from the high protein diet (Table 1), and mortality was actually
higher in the low protein group. A similar study was conducted in
another laboratory and likewise no adverse effect from high protein
diets was detected.13 In the latter study, however, increased mortality
in dogs receiving the low protein diet did not occur.
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Check table one on page 4
http://www.purina.ca/images/articles...alFunction.pdf