To brush your dog. Items like the Furminator are a scam. They cost so much money, and there are so many inexpensive ways to groom your pet. The brush I have costed me three dollars at Wal-Mart, and it took me about five minutes of brushing to do all this:
So, before you go waste money on an expensive grooming tool... realize you don't need to. Just a normal brush will suffice. Expensive stripping and grooming tools really aren't necessary unless you show. I even got down to Aero's undercoat with just this REGULAR brush, and it hardly took any effort. You can go to Petsmart and pick out a topcoat brush and an undercoat rake for about a quarter of the price you'd spend on an item like the Furminator and similar commercial brands.