The most challenging aspect of this pastel painting is blending the hairs into the fine sanded surface to create a fine, smooth line. Perhaps, ArtSpectrum Colorfix paper should not have been my choice for this piece since it is taking me longer to achieve the results I want with the fur.
I have just ordered some Wallis very fine sandpaper (museum grade) and it is suppose to be able to handle up to 25 layers of pastel. I can't wait to try it and see the results for myself if it holds true to the manufacturer's claim. I hope that the 800 grit is fine enough to allow the pastel to fill the tooth without too much blending.