The Furminator Quickly and easily removes the undercoat and loose hair without damaging the topcoat The ultimate massage experience Reduces shedding up to 90% Guaranteed to reduce shedding better than any brush, comb or rake Works great on all shedding, long & short-haired dogs & cats Brings out the pet's natural oils, promoting healthy skin and a shiny topcoat Helps to eliminate hairballs in cats Reduces the amount of airborne elements that can cause allergic reactions in many people These are really fantastic. They don't look much but they do work.  The small will suit a Toy size dog to a Cocker Spaniel size dog. The Medium will suit a Border Collie size dog. The Large will suit a German Shepherd size dog.