When dogs eat a high moisture, whole food diet, especially like our dehydrated foods, their stool will not look the same as it did when consuming a dry kibble or raw food.
Their stool will reflect the colorful ingredients going in. It's normal to see pieces of carrots, spinach, etc. present in the stool. The nutrients, phyto-nutrients and antioxidants from the foods are still being absorbed. Since the food is high in moisture and fiber it's also common for the stool to be more voluminous.