'K Mikey - you have obviously read different articles to the ones I have, to say nothing of EXPERIENCE. And I am talking about rearing puppies, not having older/working dogs on a high protein food. Each to their own but for sure 32% protein didn't do much for Frankie ..... and I've never fed that high a level of food to those pups I reared, and never had the problems he had (much as again, some of it could have been in his bloodlines, and not in mine).Studies have shown conclusively and multiple times protein levels do not contribute to orthopeadic conditions in young and growing dogs nor does it contribute to renal failure in older dogs. As a matter of fact because older dogs are less efficient at using protein so they actual require more as they age to maintain muscle mass.
Protein while it has the same caloric content as carbs is virtually never used for energy and never stored as fat. Excess is excreted. It does not contribute to weight gain which is a big risk factor for developmental orthopeadic condition. Now most hi protein foods are High fat as well and Fat has twice the calories as carbs so while not a problem per say if weight and portions are not controlled it can lead to excessive weight and a problem.
For what its worth I only feed Higher protein foods n o less than 27% and even higher when participatiang in dog sports. Higher protein levels have been demonstrated to reduce the incident of soft tissue injuries in sled dogs when training, Significantly.
Further, my vet, who specialises in bone problems and did the full x-rays on my hound, was in full agreement with my thoughts on the subject.