She doesn't pay bills. She never gets supper ready. She can't even do housework. So why is she a cherished member of the family? Why does it bring her owners joy just to give her joy? Why can she make them happy just by being herself?
Simply because they love her.
Rhonda explores the loving relationship she has with her Creator through the illustration of her own relationship with Sadie. After all, if a dog-lover can care deeply for a pet who brings nothing to the table, needs to be constantly looked after, and gets into trouble, maybe that's why God can find joy in flawed, fallen, imperfect human beings.
Simply because he loves us.