Science Diet Puppy Food
My Maltese Dottie had eye stains that weren't too bad but I still wanted to see if I could make under her eyes whiter. Every night I wash her face with Johnson's No Tears Baby Wash (careful not to get in the eyes). She also eats a healthy diet of Science Diet puppy food that seems to have also helped.
I warn you though, when you switch a puppy's food, they can get a very upset tummy so do so slowly. Mix a bit of the new food with the old food until eventually, you can give your little girl or boy all of the new food and they will be used to it!