It is a commonly held, but unfortunately erroneous view that high protein and high fat foods are hard on the liver/kidneys of most dogs. Poor quality protein and rancid fats are very hard on the liver and kidneys for sure. Unfortunately, most kibble, including the high-protein kind, is sprayed with rancid fat and contains poor quality proteins.
Good quality high protein/fat dry or wet foods (like Orijen/Acana) might not be indicated for dogs with chronic health conditions, but they are totally fine and preferred by many for healthy dogs - as long as fresh water is provided, and as long as the owner ensures that their dogs are drinking that water.
Unfortunately we all have to spend a lot of time and money to hit on a food or two that is just right for our dog, and rotate those foods for optimum health.
Suzan, this is so not true. Here's a story from petdiets.com. Petdiets.com is very respected in the veterinary community.