I use a flea comb to find "flea dirt." You can distinguish it from regular dirt by putting the “dirt” on a wet paper towel. If the dirt spreads like blood, it's from fleas. Then I treat my cats with a product called revolution.The look of this thing reminds me of a flea comb. Which I haven't figured out how to use, because the fleas don't come out of the fur, they stay attached under the fur somehow, to my and my cat's frustration... Just wondering how you'd use the Furminator and if it's similar?