Looking at the guaranteed analysis of products, you'll see percentage values of proteins and fats in the minimum and fiber and moisture in the maximum. (mypetneedsthat.com)
It also gives you suggested percentage values you should aim for each day, this could be 40 % protein, 40 % carbs and 20 % fat for example. (simplycantara.com)
Notes: Price: Closing price per share; P / E: Price to earnings ratio; Total Return: The total return generated by the stock over the last year; Dividend Yield: Expected - annual - dividend divided by price, expressed as a percentage; P / B: Price to Book Value Ratio; Earnings Yield: Earnings divided by Price, expressed as a percentage (moneysense.ca)