The American Kennel Club (AKC) with a desired size of 23 inches (58 cm) tall and 75 pounds (34 kg) for females, 25 inches (64 cm) tall and 85 pounds (39 kg) for males. Heavier individuals (90 lb (41 kg)) and dogs smaller than 75 pounds (34 kg) are commonly seen. There is often a marked size difference between males and females. Weights upwards of 100 pounds (45 kg) are also seen.[1]