I use Shure Pets Dazzling Dark Shampoo on Amber and it works really nice on here hair. Amber is a Yorkie Pooh and sometime her hair gets a little wavy when I used the Dazzling Dark it helps keep her hair straight and it seams like it much softer. Here is a post on what it does:
Ambers Paw Stop: This Weeks Feathered Shure Pet Product