A dog's undercoat helps protect them from the elements. By shaving them down you destroy all natural protective properties their coats offer them. You also increase the chances of bug bites, sunburns, and other skin irritations. Removing dead undercoat will help keep them cooler. The Groomer Essentials Large Deshedding Tool Set easily removes loose undercoat from large breeds to reduce shedding. This set includes the blade and handle.