Hi Chuckles,
To answer your question about protein…. I don’t have a reference right off hand but I have seen it reported as a quick “down and dirty” estimation to use 1 gram/lb for dogs and 2 grams/lb for cats. This provides a lot more protein than NRC nutrient recommended allowance.
For example my Lab weighs 68 lbs. NRC min requirement for protein is 2.62 x body weight in kg to the 3/4 power. For my 68 lb lab that calculated out to 34 grams of protein. NRC min req assumes a really high digestibility and an ideal amino acid profile.
The NRC recommended allowance is 3.28 X body weight in kg to the 3/4 power. For my Lab that calculates out to ~43 grams protein.
Diets formulated for dogs whose medical needs require no excess protein over metabolic needs are formulated close to these levels.
But for a dog without restrictions protein is usually fed at higher levels and by using the 1 gram/lb “rule” at 68 grams protein you can see that this is more than adequate assuming a decent digestibility and AA profile. Dogs etc don’t have a protein requirement so much as they have amino acid requirements.
In regards to fat, this is really dog to dog variable. My labs have always been “easy keepers” meaning a few calories goes a long way. I tend to stick with fat levels around 10-12 % allowing them to eat a larger volume of food. Also of the three macronutrients, protein carb and fat, fat is the most efficiently retained by the body as fat. Calories though are key for body condition as excess calories from any source result in fat storage.
