The Blue is steel blue-grey in colour to the roots on the back, sides and belly. The area around the side of the nose is white and the feet are also white. There may also be white on the chin and sometimes patches of white on the belly. The eyes are black and the ears are dark grey.
Many Blues develop silvering (a sprinkling of white hairs particularly around the neck) as they get older and the blue colouring lightens.
Blue can be combined with any pattern or coat type to produce Blue Mottled, Blue Satin, etc.