A guaranteed analysis on any dog food label is intended to summarize the nutritional content of the food inside. At minimum, guarantees are required for minimum percentages of crude protein and crude fat, and maximum percentages of crude fiber and moisture.
By comparing guaranteed analyses of different dog foods, you can assess the ratio of protein, fat, and fiber, and select the recipe that will be provide your dog with what they need.
When comparing guaranteed analyses of different foods, it's important to have a little context for how different types of dog foods are represented on labels (for example, fresh dog food appears quite different than kibble on a label, due to moisture content).
Here, our Veterinary Nutritionist Dr. Justin Shmalberg explains more about how to read a dog food label: