So many people are blindly following the marketing fad of high protein diets for dogs and cats. Slick marketing tries to convince you that "your dog is a wolf" and so forth. Not only is that untrue, wildly inaccurate, but it is quite dangerous to your dog in particular. Science shows that there are links between feeding excessively high protein diets to cancer in dogs and cats.
Dogs have specific nutrient requirements for their health and wellness, feeding excessively high protein levels over a long period of time can be unhealthy for dogs. There have been studies in humans and rats that found a correlation between high levels of ammonia from certain high protein diets and higher rates of cancer. These cancer rates were attributed to high levels of toxins created by the higher protein, such as ammonia and other nitrogen components which build up in the large intestine.
Check out this explanation by Dr. George C. Fahey, of the University of Illinois.
Check the label of the pet food you are feeding. Your dog food protein should not exceed 28% and cat food protein should not exceed 35%. Use science as your guide, not marketing hype.
Disclosure: This video was presented by Lucy Pet Products, and I work for Lucy Pet.