I tried the Furminator on both short haired and long haired dogs.

I was not impressed. I felt that it was cutting the under hairs more than pulling loose ones out. I prefer using a metal comb. I lift the hair away from the skin and put the comb at the skin and comb out. It takes a while to cover the entire dog, but it gets all the loose hair. If I want to thin the dogs coat, I can use a small mat breaker.

Just my opinion. I've seen the Furminator in catalogs like Harriet Carter for around $10.