Quote from the Official Standard

"Whole or smut (i.e. whole colour with black mask or muzzle).   Only whole colours (which should be brilliant and pure of their sort) viz., brindles, reds with their various shades, fawns, fallows etc., white and pied (i.e. combination of white with any of the foregoing colours).  Dudley, black and black with tan highly undesirable."

Fawn

Dark fawn

Fallow

Brindle - Mahogany

Brindle - Dark

Brindle light

Red - Dark

Red - Light

Brown

White

Silver white 

Red & White (Pied)

Fawn & White (Pied)

White with black mask