Dogs Don't Do Dishes — Rebecca Lisle

Metal-Mutt is an amazing robot dog who can clean, iron, cook, and wash up. He is miserable living with the lazy Crumms who make him do endless work, but ignore him. Then he spots Cherise Orchard falling into the river and leaps to her rescue. As he has no collar, Cherise takes the brave dog home with her. And it doesn't matter at all that his insides have rusted, and now "Prince" can't do much work at all.