While meat is by far the most common protein source in natural dog food, other sources include eggs, milk and plant proteins. Ideally, meat protein is supplemented with one or more of these other sources in the dog’s diet. If meat is used as the sole protein, the food must contain a minimum of 25% by weight, but no more than 75%.
Canine nutritionists consider that the minimum amount of daily protein necessary to supply all necessary amino acids is 0.57 g/lb of body weight. Whole egg protein perfectly matches this amount, making cooked eggs the best possible source for a dog. As the sole protein source, eggs need only constitute 2%, or one egg per pound of food.