I saw this thread and was wondering this myself...I'm not sure of the exact ratio, but the ratio in Dr. Pitcairn's "Doggie Oats" is based on approximately 13 cups of ingredients (minus water), of which 5 cups are grain, 6 cups are meat, and 1 cup is veggies (the other cup is misc. supplements, vitamins, and flavorings). This means the actual RECIPE is about 38% carbs, 46% meat, and about 7.5% veggies...yet AFTER cooking the book says thsi recipe provides a protein level of 33% and 30% fat because of the ingredients used together to get this result.
So, I'm not sure exactly what the ratio should be when you are planning meals
I'm just going to follow the recipes and the instructions and things should work out
Another thing he emphasizes is QUALITY of food, and VARIETY....I think you'll be safe buying the best ingredients you can afford, and change them up a bit each time you cook for your dog. That way, you can be sure they're getting the nutrition they need.