The Boston Terrier is a lively, highly intelligent, smooth coated, short-headed, compactly built, short-tailed, well balanced dog, brindle, seal or black in color and evenly marked with white. The head is in proportion to the size of the dog and the expression indicates a high degree of intelligence. The body is rather short and well knit, the limbs strong and neatly turned, the tail is short and no feature is so prominent that the dog appears badly proportioned. The dog conveys an impression of determination, strength and activity, with style of a high order; carriage easy and graceful. A proportionate combination of 'Color and White Markings' is a particularly distinctive feature of a representative specimen. "Balance, Expression, Color and White Markings"should be given particular consideration in determining the relative value of GENERAL APPEARANCE to other points. Size, Proportion, Substance Weight is divided by classes as follows: Under 15 pounds; 15 pounds and under 20 pounds; 20 pounds and not to exceed 25 pounds. The length of leg must balance with the length of body to give the Boston Terrier is a sturdy dog and must not appear to be either spindly or coarse. The bone and muscle must be in proportion as well as an enhancement to the dog's weight and structure. Fault: Blocky or chunky in appearance. Influence of Sex. In a comparison of specimens of each sex, the only evident difference is a slight refinement in the bitch's conformation. Head The skull- is square, flat on top, free from wrinkles, cheeks flat, brow abrupt and the stop well defined. The ideal Boston Terrier expression- is alert and kind, indicating a high degree of intelligence. This is a most important characteristic of the breed. The eyes- are wide apart, large and round and dark in color. The eyes are set square in the skull and the outside corners are on a line with the cheeks as viewed from the front. Disqualify:- Eyes blue in color or any trace of blue. The ears- are small, carried erect, either natural or cropped to conform to the shape of the head and situated as near to the corners of the skull as possible. The muzzle- is short, square, wide and deep and in proportion to the skull. It is free from wrinkles, shorter in length than in width or depth; not exceeding in length approximately one-third of the length of the skull. The muzzle from stop to end of the nose is parallel to the top of the skull. The nose- is black and wide, with a well defined line between the nostrils. Disqualify:- Dudley nose. The jaw- is broad and square with short regular teeth. The bite is even or sufficiently undershot to square the muzzle. The chops are of good depth, but not pendulous, completely covering the teeth when the mouth is closed. Serious Fault:- Wry mouth. Head Faults:- Eyes showing too much white or haw. Pinched or wide nostrils. Size of ears out of proportion to the size of the head. Serious Head Faults:- Any showing of the tongue or teeth when the mouth is closed. Neck, Topline and Body-The length of neck- must display an image of balance to the total dog. It is slightly arched, carrying the head gracefully and setting neatly into the shoulders. The back- is just short enough to square the body. The topline- is level and the rump curves slightly to the set-on of the tail. The chest- is deep with good width, ribs well sprung and carried well back to the loins.