The American Kennel Club accepts the colors fawn, red and brindle as the standard colors for a bullmastiff, with fawn being the most common color for the breed. White markings are considered a disqualifying fault, except for the small white spot on the dog's chest. The fawn color can range from reddish brown to a very light brown. A combination of red, brindle and fawn colors is also acceptable.
Most purebred bullmastiffs come in a solid fawn color, but it's not uncommon for bullmastiffs to have a light- to dark-red coat. Bullmastiffs with a brindle pattern often have an overlay of fawn and red colors. Though spots of black and white are common markings for the breed, these are considered flaws and are not specific markings for the dogs.
The bullmastiff has a short dense coat that rarely sheds and is easy to maintain and clean by using a rubber curry. Despite its large size, a bullmastiff is not an active dog breed and can adapt to most home environments. They have innate protective instincts, and they don’t need training to be a guard or attack dog. Although bullmastiffs have a reputation for attacking trespassers, they are not actually bred to attack but to keep guard and hold down anyone who threatens the dog's family or territory.