The FURminator is the only really functional cat-grooming tool I’ve ever found. The stiff steel rake grabs the undercoat while leaving the topcoat intact. It does a tremendous job of removing loose fur. Be prepared, especially the first time you brush your cat. For my cats, the big difference between the FURminator and regular brushes is that the softer bristles of standard brushes just get hair from the surface — the topcoat, and a bit of undercoat — whereas the stiffer teeth of the FURminator primarily snag the undercoat (and lots of it!) as well as loose hairs of the topcoat. The best part is that all that fur goes in the trash, and not on your sofa, bed, or carpet. The environment of my apartment has been improved dramatically, and I no longer need to spend a lot of time vacuuming up cat hair. While the FURminator is expensive for a grooming tool, it’s solidly constructed and ergonomically designed, and best of all, it really works. My vet used it on my cats while they were in for a visit. I was shocked at how much hair came off in just a few strokes, so I bought one to take home and have been using it for several months. I then threw out the other standard, cat/slicker brushes I had acquired over the years, and bought two more FURminators to give to cat-owning friends. The one I use is 1.75″ and is intended for cats, so although the FURinator comes in larger sizes for dogs, I can really only speak to its utility when it comes to cats.
Here's a dog getting de-fur'd.