CKCSC breed standard (USA)
An active, graceful well-balanced dog, very gay and free in action; fearless and sporting in character, yet at the same time gentle and affectionate.
Head: The skull is slightly rounded, but without dome or peak; it should appear flat because of the high placement of the ears.
Eyes: Large, round and set well apart; color a warm, very dark brown, giving a lustrous, limpid look. There should be slight cushioning under the eyes, which contributes much to the sweet, gentle expression characteristic of the breed. Faults: Small, almond-shaped, prominent or light eyes; white surrounding ring.
Nose: There should be a shallow stop and the length from the base of stop to tip of nose should be at least 1 1/2 inches. Nostrils should be well developed and the pigment uniformly black. Putty, or "dudley" noses and white patches on the nose are serious faults, as are small, pinched nostrils.
Muzzle: Well tapered; mouth level; lips well covering. Faults: Sharp, pointed or snipey muzzle. Full or pendulous lips. Flesh marks, i.e. patches of pink pigment showing through hair on muzzle.
Teeth: Strong and even, preferably meeting in a scissors bite, although a level bite is permitted. Undershot mouths are greatly to be discouraged; it should be emphasized, however, that a slightly undershot bite in an otherwise well-balanced head with the correct, sweet expression should not be penalized in favor of a level mouth with a plain or hard expression. Faults: Weak or crooked teeth, crooked jaws.
Ears: Set high, but not close, on top of the head. Leather long with plenty of feathering and wide enough so that when the dog is alert, the ears fan slightly forward to frame the face.
Neck: Fairly long, without throatiness, well enough muscled to form a slight arch at the crest. Set smoothly into nicely sloping shoulders.
Shoulders: Sloping back gently with moderate angulation, to give the characteristic look of top class and elegance.
Body: Short coupled with ribs well sprung but not barrelled. Chest moderately deep, leaving ample heart room. Back level leading into strong, muscular hindquarters. Slightly less body at the flank than at the rib, but with no tucked-up appearance.
Legs: Forelegs straight and well under the dog, bone moderate, elbows close to the sides. Hindlegs moderately muscled; stifles well-turned; hocks well let down. The hindlegs, viewed from the rear, should parallel each other from hock to heel. Pasterns strong and feet compact with well-cushioned pads. The dog stands level on all four feet. Faults: loose elbows; crooked legs; stifles turned in or out; cow hocks; stilted action; weak pasterns; open feet.
Tail: Set so as to be carried level with the back. Tail should be in constant characteristic motion when the dog is in action.
Docking: Docking is optional, but whether or not the tail is docked, it must balance the body. If docked, tail must not be cut too short; 2/3 is the absolute minimum to be left on the body, and the tails of broken-colored dogs should always be docked to leave a white tip.
Coat: Long and silky and very soft to the touch; free from curl, though a slight wave is permissible. Feathering on ears, legs and tail should be long, and the feathering on the feet is a feature of the breed.
Trimming: NO trimming of the dog is permitted. However, it is permissible and often desirable to remove the hair growing between the pads on the underside of the foot.
Size: Height 12 to 13 inches at the withers; weight, proportionate to height, between 13 and 18 lbs. These are ideal heights and weights; slight variations are permissible, and a dog should be penalized only in comparison with one of equal general appearance, type and quality. The weedy specimen is as much to be penalized as the oversized one.
Colors: The following colors are the only colors acceptable:
Blenheim - Rich chestnut markings well broken up on a pearly white ground. The ears must be red and the color evenly spaced on the head, with a wide white blaze between the ears, in the center of which is the much valued lozenge (diamond), or "Blenheim Spot". The lozenge is a unique and highly desirable, though not essential, characteristic of the Blenheim.
Tricolor - Jet black markings well broken up on a pearly white ground, with rich tan markings over the eyes, on cheeks, inside ears and on underside of tail.
Ruby - Whole-colored rich red.
Black & Tan - Jet black with rich tan markings over eyes, on cheeks, inside ears, and underside of tail.
Faults: White marks on whole-colored specimens, heavy ticking on Blenheims or Tricolors.
It is important to remember that a dog can have one or more of the faults listed in the Standard, in moderation, and still be an overall typical, gay, elegant Cavalier. On the other hand, bad temper or meanness are not to be tolerated and shall be considered disqualifying faults. It is the typical gay temperament, combined with true elegance and "royal" appearance which are of paramount importance to the breed.