Loyalty is how much your dogs love you! In order to level up your sanctuary and progress through your dogs journey, you must collect loyalty from them. It is given over time by each dog and is collected by pressing the pink heart icon that appears over a dogs head.
You can see how much loyalty a dog gives per minute by either tapping the dog to bring up their profile, or by opening the Woof Book. Raise a dogs happiness level to increase the amount of loyalty they give per minute. You can do this by feeding, petting, or giving treats to your dogs!
Giving your dogs their favorite items will raise their loyalty per minute for a limited time. You can find your dogs favorite items in their "About" page in the Woof Book.