James,
then just dial up the black in your selective color palette. That will remove the grayish look to the coat.

When I do Rotties -- and I do a lot of them -- I set my white and black levels in ICorrect Professional which limits the upper end and maxes the black and then I adjust brightness and contrast. That way I get a real black and yet I can bring up the texture.

Keep in mind that black levels on a monitor are not the same as black levels in a print. You should see more detail in the print.

Jim