Every single day people ask me how I keep Nemo, my Great Pyrenees, so white? Mostly a pyr handles it solo and just sheds dirt, but for the rare times he needs a bath I use Earthbath's all natural light coat, brightening shampoo.
This lavender scented shampoo is gentle on his skin and leaves him smelling great. Nemo's coat may or may not be lighter after a bath, but other shampoos have turned him spotty or slightly orange. Can you imagine an Oompah Loompah/Pyrenees hybrid?
If you want a dog that gets you a lot of attention, I suggest calling Nemo's friends at the Great Pyrenees Rescue of Northern California. If you want to keep their coat looking its best, Earthbath's light color brightening shampoo has offered me great results.