Home > Dog Breeds > Mastador
85-140 lbs
Labrador Retriever
Mastadore, Mastidoor

The Mastador is a designer dog, an intentional cross between an ancient guarding breed, the English Mastiff, and the Labrador Retriever, a dog that has spent the last quarter-century in the top spot for popularity according to the American Kennel Club. The resulting hybrid is a very large and friendly animal who can be particularly animated during their younger years. Although they are generally amicable with most people and animals, they usually retain enough protective instincts to make an excellent watchdog, and are fairly easy to train, although some may tend towards stubbornness. Early training and socialization will help this canine to become an outgoing and dependable member of the family.

Guard, Hunting Companion, Family Companion
Date of Origin
Labrador Retriever and Mastiff

Mastador Health

Average Size
Height: 26-30 inches Weight: 105-160 lbs
Height: 24-28 inches Weight: 85-140 lbs
Major Concerns
  • Elbow Dysplasia
  • Pulmonic Stenosis
  • Cataracts
  • Retinal Dysplasia
  • Canine Hip Dysplasia
  • Obesity
  • Gastric Dilation Volvulus (GDV) or Bloat
Minor Concerns
  • Patellar Luxation
  • Entropion
  • Ectropion
  • Osteosarcoma
  • Hypothyroidism
  • Exercise Induced Collapse
  • Exposure Keratopathy Syndrome
  • Progressive Retinal Atrophy (PRA)
Occasional Diagnoses
  • Epilepsy
  • Hemophilia
  • Panosteitis
  • Atopic Dermatitis
  • Ataxia
  • Osteochondrodysplasia
  • Diabetes
  • Degenerative Myopathy (DM)
Occasional Tests
  • Eye Examination
  • Biopsy
  • Skin Evaluation
  • Radiographs
  • Blood And Urine Analysis

Mastador Breed History

 The Mastador is a hybrid animal, a cross between the Labrador Retriever, a gun dog that specializes in retrieving waterfowl, and the English Mastiff, an daunting giant of a canine who is surprisingly good-natured. Mastiff-type dogs were even recorded as marching alongside the armies of Hannibal when they crossed the Alps and have been depicted in ancient stone and artwork thousands of years old in Mesopotamia and in Asia. As consummate guard dogs and excellent hunting companions, they quickly became valued for their steadfast natures as well as their easy-going temperament by both the peasants and the wealthier landholders throughout England. World Wars I and II had a catastrophic impact on Europe’s canine population, and the largest dogs such as the English Mastiff were the hardest hit. Their size put them in double jeopardy, making them both difficult to feed during times of rationing, and attractive as military dogs, employed to pull munitions carts out to the front lines, a dangerous and sometimes deadly job. Once both of the wars had finally ended the English Mastiff breed had become nearly extinct, at one point reduced to just fifteen dogs known worldwide that were suitable for  contribution to the gene pool. Mastiff puppies were imported to England from both the United States and Canada to help revive the breed, and they resurged in popularity, capturing the spot of the 28th most popular breed according to the AKC. The Labrador Retriever also has a long and somewhat uncertain history, portions of which we can only guess at. Experts are generally in agreement that the St. John’s dog, a water dog that became extinct as recently as the 1980’s, was the foundation breed that was used for the Labrador Retriever breed, but not much is known about how the St. John’s dog came to be. The St. John’s dog worked alongside fishermen that worked the coasts of Newfoundland and with its short, oily coat was as at home swimming in the water as it was running on land. The St. John’s dogs, like the Labradors, were retrieving dogs, although they specialized in retrieving fish, nets, and ropes from the water, rather than collecting the waterfowl that the Labrador was bred for. In the 1800’s James Harris and Walter Scott were fortunate enough to meet while out shooting.  Both men had been breeding specific St. Johns dogs for their suitability as gun dogs and when Mr. Harris gifted of two of his male retrievers to Mr. Scott, Mr. Scott bred them to his own dogs, giving rise to today’s modern Labradors. 

Mastador Breed Appearance

This combination of breeds produces canines that are quite large, generally in the 85 to 160 pound range, with long legs and an athletic build. They have wide heads, although narrower than the head of the English Mastiff, and while the exceptionally short muzzle of the Mastiff is sometimes passed down, the square, medium-length muzzle of the Labrador is seen more frequently. The Mastador may have some wrinkling around their muzzle, their almond-shaped eyes can range from a dark brown that is nearly black to hazel, and their triangular ears have rounded tips and hang down close to the sides of their head, framing their face. The coat of this crossbreed is double layered, consisting of a water-resistant, dense undercoat which is overlayed by a short, relatively coarse layer of straight fur that lies close to the skin, although the Labrador Retriever heritage may sometimes contribute a slight wave in the coat.  Mastadors usually come in solid colors, with differing shades of black, brown, and golden, and they often have black or white markings on their feet and chest. Black face masks are also commonly passed down to the Mastador from the Mastiff.  

Eye Color Possibilities
Nose Color Possibilities
Coat Color Possibilities
Coat Length
Short Medium Long
Coat Density
Sparse Normal Dense
Coat Texture
Straight Wiry Wavy Curly Corded

Mastador Breed Maintenance

The Mastador doesn’t have extensive grooming needs; their coats are generally short and stiff, making them proficient at shedding dirt and water, so in ideal conditions, they should only need bathing a few times a year. This dog, being very athletic and a lover of water, may have a yeast or bacterial buildup within the ear if not checked; twice weekly cleaning and drying of the ear at minimum is recommended and even more often if your Mastador is a daily swimmer. Due to his very active nature, observing his gait and looking at the condition of the footpads should be included in the grooming routine. Weekly brushing will help to distribute the dog's natural healthy oils throughout the coat as well as remove loose fur. 

Brushes for Mastador
Slicker Brush
Nail Clipper
Brushing Frequency
Daily Weekly Monthly

Mastador Temperament

This crossbreed is typically a friendly and social breed, although they may be more reserved than outgoing, and some protective instincts are likely to be passed down through the Mastiff breed. The Mastador is a very large and powerful canine that can be a bit rambunctious, particularly during their long adolescence, and any interactions between children and these dogs should be closely supervised to prevent muscle and joint strain on the part of the dog or bumps and bruises on the part of the child. These large to giant-sized dogs are generally friendly and gentle towards strangers and other animals as well, but proper socialization and early training will help to fully cement these tendencies and to prevent any shyness, timidity, or aggressiveness from taking root. This canine should be very trainable in most cases, particularly if the training is started early in their lives, however, stubbornness can be an issue and patience will be required. 

Mastador Activity Requirements

The Labrador Retriever is an active and athletic dog breed that requires a great deal of exercise each day. Fortunately for the owners of Mastador hybrids, the Mastiff is a much more placid canine and they don’t require nearly as much activity as the Labrador Retriever. In the majority of cases, this particular crossbreed is content with about an hour or so of vigorous activity. Labrador Retrievers and Mastiffs are both known for boisterous behavior when they are young and although the Mastiff usually outgrows this stage, some Labradors continue to be spirited throughout their life. It is important to remember that overly strenuous activity and activities that involve jumping or leaping can cause stress and damage to the joints of very large and giant sized dogs like the Mastador. Even if they canine does not appear to be worn out walks should be frequent, but they should be kept relatively short. Care should be taken to reduce strain on growing bones and joints at every opportunity; a nice long walk without impact will please the Mastador. This dog requires a great deal of room and while some mature candidates may be able to adapt to apartment life, most are too active and are better able to thrive in a larger space with a yard.   

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

Mastador Food Consumption

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

Mastador Height & Weight

6 Months
Height: 17 inches Weight: 77 lbs
Height: 16 inches Weight: 67 lbs
12 Months
Height: 25 inches Weight: 115 lbs
Height: 23 inches Weight: 95 lbs
18 Months
Height: 27 inches Weight: 120 lbs
Height: 25 inches Weight: 100 lbs

Mastador Owner Experiences

Three and a half years.
3 People
Sugar is an absolute delight. She is a rescue and we have owned her only for a few months. We look forward to many years with this lovely girl!
1 month, 3 weeks ago
12 Weeks
3 People
She enjoys pulling rope and playing with our two year old boxer.
1 month ago
18 Months
3 People
House & Yard
Unfortunately my girl was not well socialized as a puppy by the breeder or possible bred without concern for parents temperament. She has severe anxiety with new people and places. It’s very sad she’s unable to go on walks or enjoy any company we have over. She gets aggravated with anyone coming in the house that isn’t family. I’ve spent thousands of dollars on vets, trainers, behaviorist with little improvement. We love her and she’s fine with just us but I’m very disappointed with the breeder. The only dog I’ve very had that wasn’t a rescue ends up being the most challenging. My advice don’t by a puppy without meeting it first. A puppy needs to come to you with ease.
5 days, 9 hours ago
Fozzy Bear
6 Years
1 People
Dog Parks
He's a humane society rescue, Very happy and silly. good guard dog. Great with kids and other dogs. Good with my cat. He likes to growl at stray cats, but he has never done any more than that.
2 hours ago
Book me a walkiee?