for all the internet rumor and mythology on the internet about high protein being bad for large breed pups growth and causing kidney issues, it is interesting that there is not a single study that confirms any of it.
so, i dont see this as controversial at all. the only thing that has been pretty well established is that excess Ca levels will cause growth issues in large breed pups. i have seen calculations estimating raw fed dogs eat a diet closer to 45%-50% protein when converted to a dry matter basis, and you will see very few people trying to argue a biologically appropriate raw diet is unsafe for pups. a higher protein diet where the protein is from quality meat sources will generally be lower in carbohydrates.
personally, i think a dry dog food with around 24% protein simply will not have alot of meat product in it and will have more grains and/or potato than are necessary for a canine. that is not to say canidae, innova, wellness at 24% protein versus iams, purina, and the like at 24% protein will have protein coming from the same sources. im sure more of the protein comes from meat sources in the former than the latter.
my opinion is that a higher protein diet with the proper balance of nutrient levels is preferable, and much closer to natural, over a lower protein diet. also consider that some of the nutritional value of meat product (as well as other product) would be expected to be lost during the processing of commercial kibbles.
Kimba (gsd) 5/9/07
Saby the mutt~1/15/01
Frisco (gsd) 6/21/02
RIP-canines-Buddy, Roxy, Kujo, Kato, Pierre
felines-Chanel, Panther, TJ