General Appearance: The general appearance shall be that of a lithe, active dog showing hard muscular condition and conveying the capability of untiring work. Movement and action shall be smooth and effortless, with good length of stride. Size, Proportion, Substance Measured at the withers, males are generally 20-23 inches in height; females 17-20 inches. The length of the dog from the point of the breastbone in a straight line to the buttocks should be greater than the height at the withers, as 10 is to 9. Strong, but refined bone.