Is kibble even Shelf-Stable?
“The truth: No “complete and balanced” pet food exists that is also shelf-stable. One example: As soon as a bag of kibble is opened, important dietary fats in the food start to go rancid, and long-term consumption of rancid fats can obviously negatively impact your pet’s health.
Also, because kibble is processed multiple times and at extremely high temperatures, effectively killing all the nutrition in the food, manufacturers assume the finished product contains no micronutrients. That’s why the final production step involves spraying on a nutrient mix (and a palatability enhancer to make pets want to eat the stuff).”