"I have a Mini Schnauzer/Yorkie, he has thick hair for the most part,except his belly. It worked great on his belly where the hair was thinner but everywhere else it took several times over one area for it to work. I wouldn't recommend for thicker hair, but for thinner it works great.
I spoke to others who have actually used the brand Andis which has worked very well for them. They're twice as much but work excellent with thick hair. I am returning this to the local Petco and getting an Andis brand."