Freckles enlarge with age, and skin color will darken when exposed to the sun. Weight will vary depending on the size of the individual dog. Rat Terriers are working terriers and should be presented in hard, muscular condition. The Rat Terrier moves with a jaunty air that suggests agility, speed, and power. Rat Terrier gait is smooth and effortless, with good reach of forequarters without any trace of hackney gait.
Rear quarters have strong driving power, with hocks fully extending.
Viewed from any position, legs turn neither in nor out, nor do feet cross or interfere with each other. As speed increases, feet tend to converge toward center line of balance. Viciousness or extreme shyness. Unilateral or bilateral deafness. Wire or broken coat.