Straight line top and under. Patches of uniform size. Belting, absence of one colour on one side. Side whiskers, fatty eye, coat faults, running lice and breaks in skin. There is a similar standard for the Harlequin, but substitute yellow for white above.
Some judges look for feet of opposite colour.
In the opinion of the breeders I've spoken to, the opposite feet colour is implied indirectly by the standard and is nice when it occures, but it shouldn't be over-emphasized. There is omission of any mention of coat quality - smooth coated cavies should have a short and silky coat. Other breeds should follow the coat quality described in those standards. Long coated pigs would not show the colour pattern very well. For those not familiar with the term, belting is like belting on mice.