I'm planning on trying this for Darla. She's a puppy now so her hair isn't very long yet but I comb her coat once a day to get her used to grooming. I focus most on the pubic and fluffy bottom, as well as the arm pits and the chest. When I had my three Shih Tzu I noticed that those mentioned areas always knotted up the worst. Here's a link for the product I am gonna order for Darla to keep her knots out.
Knot Detangler for Dogs | Pet Head