Home > Dog Breeds > Doubull-Mastiff
130-200 lbs
United States

The Doubull-Mastiff is a designer dog composed of two pure breeds, the Bullmastiff and the Mastiff.  The Doubull-Mastiff will be a giant breed. His dense coat will be short and shedding will be low. Brushing can be done weekly to remove dead hair and to keep his coat shiny. He will be a low energy level dog and a loving, sweet, loyal companion - a gentle giant who makes a wonderful family pet. Owners of this hybrid say because of his sheer size, the Doubull-Mastiff is not suited for apartment living.

Date of Origin
Bullmastiff, Mastiff

Doubull-Mastiff Health

Average Size
Male Doubull-Mastiff size stats
Height: 27-36 inches Weight: 130-200 lbs
Female Doubull-Mastiff size stats
Height: 27-36 inches Weight: 130-200 lbs
Major Concerns
  • Entropion
  • Elbow Dysplasia
  • Retinal Dysplasia
  • Hip Dysplasia
  • Bloat
  • Ataxia
Minor Concerns
  • Ectropion
  • Progressive Retinal Atrophy
  • Cataracts
  • Retinal Dysplasia
Occasional Diagnoses
  • Obesity
Occasional Tests
  • X-Rays
  • MRI
  • CT Scan
  • Eye Examination
  • Myelography (Dye And X-Ray to Assess The Spinal Cord)

Doubull-Mastiff Breed History

Because the Dobull-Mastiff is a very modern breed, documentation on their history is limited.  However, we can go over his parent’s history. The Bullmastiff was first brought into the United States in the 1920s by oil tycoon John D. Rockefeller who wanted the large intimidating canine to guard his country estate. Developed in England around the 1860’s, the Bullmastiff is a cross between the Mastiff and the Bulldog. Gamekeepers bred these two formidable breeds to help them ward off poachers who wanted to gain access to the wild animals that were within the confines of estate. The Bullmastiff was known as the “Gamekeeper’s Night Dog” because he was agile, quick and strong despite his size and could run down and “detain” a poacher. It is believed that Mastiff-like dogs lived in Asia dating back to 2500 B.C.  These dogs were used for hunting lions, fighting in the arenas and in war time. In the Roman Colosseum, they were matched against bulls, tigers, bears and lions. Julius Caesar wrote about the Mastiff-type breed in his account of invading Britain in 55 B.C. The Mastiff of today was developed in England over two thousand years ago. Bred to be guard dogs, they protected livestock from wolves and other predators. During the 1800s the Mastiff was used in cruel sports such as dog fighting, bear baiting and bull baiting.  During World War I and World War II the breed almost became extinct; they were used as munitions carriers and were also hard to keep fed when food was scarce.

Doubull-Mastiff Breed Appearance

The Doubull-Mastiff will have the physical characteristic of both his parents.  He will be a giant breed and sport a very muscular body.  The Doubull-Mastiff is a tall dog with a coat is that is dense and short.  He is either fawn or brindle in color. The Doubull-Mastiff will have large square heads with V-shaped floppy ears and short muzzles. Their facial expression is noble and loving. The breed has deep large jowls and are known to drool, necessitating cleaning of the face every day. They have a dark “mask” around their eyes and nose. The Doubull-Mastiff may have a slight underbite and the skin around their face can be wrinkly and have folds.

Eye Color Possibilities
brown Doubull-Mastiff eyes
Nose Color Possibilities
black Doubull-Mastiff nose
Coat Color Possibilities
fawn Doubull-Mastiff coat
brindle Doubull-Mastiff coat
Coat Length
Short Medium Long
Coat Density
Sparse Normal Dense
Coat Texture
Doubull-Mastiff straight coat texture
Straight Wiry Wavy Curly Corded

Doubull-Mastiff Breed Maintenance

The Doubull-Mastiff has a short and dense coat that requires little maintenance. Weekly brushing can help remove loose fur. The folds and wrinkles on his face should be cleaned daily and kept as dry as possible so that moisture accumulation does not cause a proliferation of bacteria and yeast..  His ears should be cleaned weekly with an ear wash.  To prevent tartar and gingivitis, his teeth should be brushed with a canine toothpaste several times a week.   His nails may need to be trimmed monthly.  It is recommended that his nails be trimmed as a puppy, so that he gets used to the practice. Once used to the regimen, many dogs grow to love the attention.

Brushes for Doubull-Mastiff
Slicker Brush
Nail Clipper
Brushing Frequency
Doubull-Mastiff requires weekly brushing
Daily Weekly Monthly

Doubull-Mastiff Temperament

The Doubull-Mastiff will have the behavior and personality traits of both his parents.  Protective of their family and good guard dogs, early obedience training and socialization with strangers and other dogs is recommended. They are usually not barkers but they are not quiet dogs.  They snort, grunt and snore. They also do a quite lot of drooling. The Doubull-Mastiff can be a little bullheaded, so patience and consistent training is a must. They can be little lazy but daily walks are required to keep him from becoming overweight. They are friendly and good with children but because of their size they should be supervised when interacting with them. Children should be taught to respect and to be gentle with animals.  They should not be allowed to ride the Doubull-Mastiff as this can cause physical harm to come to him. The Doubull-Mastiff is a gentle and loving giant who will need to be reminded that he is not a lapdog.

Doubull-Mastiff Activity Requirements

Your Doubull-Mastiff will enjoy his daily walks.  He will also like playing fetch and running in a fenced in yard. Play should be limited during high temperatures. His energy levels will be higher when he is a puppy but because he is growing very fast, it is important for him not to overdo activities despite his youth. Excessive exercise for a growing large breed puppy can cause damage their joints and bones. The Doubull-Mastiff may want to live the life of a couch potato but daily exercise is required to prevent obesity.

Activity Level
Low Medium High
Rec. Walk Mileage Per Week
7 miles
Minutes of Activity Per Day
30 minutes

Doubull-Mastiff Food Consumption

Cups Per Day
4 cups
Daily Cost
$2.8 - $3
Monthly Cost
$80 - $90

Doubull-Mastiff Owner Experiences

Book me a walkiee?
Sketch of smiling australian shepherd