[theBCnut]

The amount to feed has more to do with the fat level than the protein level. Carbs and protein each have about 4 kcal per gram, while fat has 9 kcal per gram. That being said, different dog foods use different feeding guidelines, so they aren’t all telling you to feed the same amount of calories. One bag might do feeding recommendations as if every dog was an athlete, another one’s recommendations might assume every dog is a couch potato. When I’m switching from one food to another, I try to be aware of the calorie count and try to keep that close to the same. Once I have them on the new food, I watch for the slightest sign that they are getting too little or too much and adjust accordingly. The foods that I feed regularly, I just know how much of that food each dog needs.