I make a shampoo and conditioner that is great for thick hair because it softens the hair and relaxes the curls - it's also good for greasy hair because it rinses VERY clean and helps restore the skin's natural oil balance. The shampoo is made with organic ingredients and the conditioner is vegan. Both have a high pH perfect for dogs. The website is
Yorkie Splash and Yorkie Shine | Yorkie Shampoo and Yorkie Conditioner I know, shameless plug.