Personally, I don't put much stock in the high/low protein issue.
Think about it: what do carnivores eat in the wild? Meat. Meat=protein.
What do wolf cubs eat? What mom regurgitates or brings home for them. (That's meat too.) I just can't buy that protein is bad for carnivores...
What I DO think is that poor-quality grain-based protein is not good for dogs (like corn)...it's just not as available to them nutritionally.
Another poster here, Merlin'sHope, has been feeding his rescued dogs a raw meat diet for years, and they've been young, old, sick, bad kidneys, bad livers, EVERYTHING that most vets would try to make you buy a certain diet for, and all of them thrived on the meat-based diet.
FWIW, our dogs get a pretty much 95% meat and bone-based diet, including the puppy. For a young dog, she's muscly and shiny and fit as a fiddle, our vets always rave about how she looks

She was fed Orijen and about 10% raw from 12 weeks up until about 3 weeks ago, when we finally switched to all raw...she's about 8-9 months old now.
__________________
Owned by:
Solomon - black DSH - king of kitchen raids (11)
Gracie - Mutterooski X - scary smart (9)
Jaida - GSD - tripod trainwreck and gentle soul (4)
Heidi - mugsly Boston Terrier X - she is in BIG trouble!!! (3)
Audrey - torbie - sweet as pie (11 months)
Patrick - blue - a little turd (but we like him anyways) (6 months)
__________
Boo, our Matriarch (August 1 1992 - March 29 2011)

Riley

and Molly