Unless you're engaging your dog in a good bit of really high activity, my opinion (based on experience) is that that is way too high.
Our Akitas were on a normal level protein food years ago but even that proved to be too much and I had to switch them to stop nocturnal incontinence caused by protein in their urine. I think the food I ended up with was about 24% protein. These were young adult dogs with good backyard exercise and walking...but nothing like agility. And Akitas don't fetch.