Just Add Water
It takes moisture to digest foods. Think about when you dog eats dry kibble -- where does the moisture come from that starts to break it down. Whatever is in the system already or what may go in through drinking water.
Remember it takes kibble about 15 hours to begin converting into usable energy. Part of that is because it has to get hydrated first! So where does that moisture come from? Other organs -- including the heart, skin, kidneys. It's called organ robbing.
To make the digestive process start more effectively without robbing other vital organs of moisture, just add a little warm water to your dog's kibble bowl.