To ensure the desirable squarely built appearance, the length of body measured from the breastbone to the point of the rump approximates the height from the highest point of the shoulders to the ground. The eyes should be very dark, oval in shape, and have an alert and intelligent expression. Black, blue, gray, silver, cream, and white poodles have black noses, eye rims and lips, black or self-coloured toenails and very dark eyes. In the apricots, while the foregoing colouring is preferred, liver-coloured noses, eye rims and lips, and amber eyes are permitted, but are not desirable. Incomplete colour of nose, lips and eye rims, or a 'mismatched' colour are considered faults by registries.