According to American Kennel Club (AKC) standards, male Neapolitan Mastiffs should measure 26–31 inches (66–79 cm) at the withers. They should weigh 130–155 pounds (60-70 kg). Females should measure 24–29 inches (61–74 cm). They should weigh 110–130 pounds (50–60 kg). Body length should be 10–15% greater than height.