Hi Sasy99! I have three totally different dogs. I have a pit bull a chow chow and a shih tzu.
my pit bull gets medicated tea tree shampoos or earth baths green tea which I absolutely love! or tropicleans aloe for the pit and chow chow.
i use a basic tearless for the faces on all three. tho i just picked up nooties tearless its a natural shampoo but not one i'll be using again. i have 15 dif types of dog shampoos lol.
i like buddy wash shampoo and conditioners too it has rose mary and mint soothing for the skin.
but for my chow chow i recently ordered offline #1 all systems pure white lightening shampoo https://petapproves.com/best-smelling-dog-shampoo-reviews/
it helps lighten stains. you can use it on white dogs and cream dogs so you can use it on both of your dogs. and than i use an espree conditioner after, next bottle i'll be going to the earth bath conditioner since thats what i use at work and i really do like earth bath products.
i've also used the mane and tail shampoo mr chips is talking about i think the first time i had dreads? it is good shampoo too you can get it at walmart or sally's beauty supply. may be one of the only shampoos that are used on ppl i'd recommend on a dog.There are a lot of useful videos on this topic on Youtube, I will leave here one of them, as many often have similar questions.Good Luck.https://www.youtube.com/watch?v=lmnU2xZ7AqA