Carbs don’t help a dog feel full. Volume of food helps a dog to feel physically full and fiber can be used to bulk up a ration. But fat and protein trigger the hormones that tell a dog or a person that they have eaten enough. And protein stays with them longer. Glucose spikes from carbs cause the body to dump insulin into the bloodstream, which clears the glucose out pretty quickly, causing the dog or human to be in search of food again soon. Protein and fat do not cause this reaction, so the need to eat again is delayed. Carbs have the same calorie count as protein.
