The Boston Terrier is a lively, highly intelligent, smooth coated, short headed, compactly built, short-tailed, well balanced dog, brindle, seal or black in colour 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 "Colour and White Markings" is a particularly distinctive feature of a representative specimen.
"Balance, Expression, Colour and White Markings" should be given particular consideration in determining the relative value of GENERAL APPEARANCE to other points.
Proportions, Substance: The length of leg must balance with the length of body to give the Boston Terrier its striking square appearance. 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.