The breed standards are pretty loose as far as look goes because these dogs are bred for the working abilities more than anything. The standard that most breeders go by is:
Temperament: Lacy's are easy to handle, spectacular workers and pets that are great with children. This breed is very sensitive to yelling. It responds better to stern or soft commands. They are energetic and dedicated dogs, capable of handling the meanest longhorn cattle or most jittery of hens, taking the job instinctively, requiring no training. They are known to replace the work of a cowboy by five times. This breed is also used for hog hunting, finding wounded deer, and treeing game. Suitable for a watch dog and both herding and droving tasks.
Height, Weight: 18-25 inches (46-64 cm.) 25-50 pounds (11-23 kg.)
Description: The coat of the Blue Lacy is smooth, tight, sleek, exceptionally clean in appearance. The origin of the unusual slate blue coat and nose is a genetic rarity. All Lacy's have minimal to full white markings on their brisket and most of the time on paw or paws. The light gun-metal gray to almost black Lacy's are classified in color as blue. The red, yellow to cream Lacy's are classified in color as red. The tri-colored Lacy's are blue with red markings over their eyes, on muzzle, under tail, and down the legs. They are classified in color as tri. Both the red and tri-colored Lacy's hold the name Blue Lacy due to the blue-color gene they possess. All Blue Lacy's eyes are very bright and stinctive orange to yellow in color. Which adds a unique touch to their appearance.