Such a dog will carry the genes for arranging pigmentgranules in the nose and other integument to show black, liver, or blue, but nothing at the E locus that allows anything other than tan hairs (or tan with brindle striping).
The E locus (let's use E or e to stand for Expression) tells the body whether or not to create and deposit pigmentgranules that show up as black or dark (including liver and blue) in the coat.