A high protein/low carb diet guideline for dry is 48% protein/14% carb and for canned would be 13% protein and 4% carb. In general, a 3 oz can is equal to 1/4 cup dry and would maintain 10 pounds of body weight. If they do not list the carb content, you would get it by subtracting the protein + fat + fiber + moisture content from 100.