How much of the undercoat does your dog shed at once? I attacked Buster with a Furminator. It left his outercoat intact, but he actually has no undercoat left. I was a bit surprised that so much of it was loose. You can actually see the skin now, when you part the fur. His back legs, which appear to be regrowing for the winter though, all you see is a bit of fluff under the outercoat. Thick, already.