Currently there are 3 size ranges of the breeds, defined by measuring from the ground to the wither, the highest point on the dog’s shoulder blades.
Miniature: Between 14 and 16 inches (35 to 42 centimeters).
Medium range: Between 17 and 20 inches (43 to 52 centimeters).
Standard range: Between 21 and 24 inches (53 to 63 centimeters).