Size
Males should be 25 to 27 inches (63 to 69 cm) tall (
AKC Std.) at the
withers and 110 to 130 pounds (50 to 59 kg). Females should be 24 to 26 inches (61 to 66 cm) at the withers, and 100 to 120 pounds (45 to 54 kg). Exceeding these dimensions is discouraged by breeders as a larger dog may be too cumbersome to be agile enough to properly perform the job for which the breed was created.
Color

Three year old female Bullmastiff
Bullmastiffs are described as fawn, red, or brindle. These are the only acceptable colors in the AKC standard. The fawn can range from a very light brown to a reddish brown. Red can range from a light red-fawn to a dark rich red.
Brindles are a striped overlay of the fawn or red.
A Bullmastiff should have no white markings, except for on the chest where a little white is allowed. See breed standard under external links for additional details
Temperament
A Bullmastiff should be confident, yet docile. A Bullmastiff is courageous, extremely loyal to its family, calm, and loving. Bullmastiffs become intensely attached to their families.[
citation needed]
Bullmastiffs can also get along with other dogs, but it is common for males not to get along with other males. The Bullmastiff can get along extremely well with children provided the dog has been properly trained and socialized. Parental supervision must be maintained when they are with children; as with most large dogs, they may knock smaller children down accidentally.
A Bullmastiff, because of its history, is a very independent dog, and likes to make its own decisions. However, with good training, a Bullmastiff will look to its owner for "permission" to act on its instincts. Early socialization and
obedience training with all members of the family will teach the dog to look to them before taking action. They are very athletic and muscular, making them incredibly fast and agile.
They were never bred for hunting purposes, and rarely show signs of aggression. The Bullmastiff is a sweet-natured breed.[
citation needed]
Health
The lifespan for a Bullmastiff is generally from eight to ten years. A Bullmastiff will not stop growing until it is about two and one half years of age. Bullmastiffs are prone to certain hereditary diseases including:
Cosmetic genetic problems include longhairs and Dudley's. These are recessives and not common. The Dudley, named after a notable Bulldog breeder of the 1800s, the Earl of Dudley, is a lack of pigment in the
mask. It can be liver colored or simply not present. These dogs can be confused with Dogue de Bordeauxs even if you know the breeds well.
aw sayup diay ang wikipedia..heheh kai la man whit markings sa chest..hehehe
never thought dli diay reliable ang wikipedia nga info.. tsk3