I am so thoroughly thrilled with this product. Be advised I've yet to use on my Yorkie, but I will later today.
I have a big double coated breed, who has oodles of coat and undercoat, and he mats at the drop of a hat; no kidding literally overnight he can mat.
I used it full strength on one rear leg, and I was able to demat him in about 30 minutes as compared to 1.5 hours about a month ago!!!!
Thanks so much Kalinka for your recommendation. Once I go through some of the shampoos I have, I will then try out their shampoo and see how I like it.