Pyrenean Mastiff

130-170 lbs
Aragonese Pyrenees (Spain)
Perro Mastin del Pireneo, Mastin d'Aragon, Mastín del Pirineo, Mostín d'o Pireneu

The Pyrenean Mastiff is a super-sized, fluffy dog with a level head. He is docile and well-behaved when he is properly trained. But like any other dog, if he does not receive proper training or socialization, he can become a nuisance. The Pyrenean Mastiff should not be confused with the Spanish Mastiff or the Pyrenean Mountain Dog. All three of these are distinctively separate breeds. The Pyrenean Mastiff can be a little independent and stubborn when he wants his way and this can make him more difficult to manage because of his size. Even though he is even-tempered, he may not be the best choice for first time dog owners.

purpose Purpose
Livestock Guardian
history Date of Origin
1273 A.D.
ancestry Ancestry

Pyrenean Mastiff Health

Average Size
Male Pyrenean Mastiff size stats
Height: 27-29 inches Weight: 140-180 lbs
Female Pyrenean Mastiff size stats
Height: 24-27 inches Weight: 130-170 lbs
Major Concerns
  • Hip And Elbow Dysplasia
  • Gastric Dilation Volvulus (GDV) or Bloat
Minor Concerns
  • Entropion
  • Ectropion
Occasional Diagnoses
  • Panosteitis
Occasional Tests
  • CERF
  • Blood And Urine Analysis
  • OFA on hips and elbows
  • Full Body Physical Examination

Pyrenean Mastiff Breed History

The Pyrenean Mastiff is said to have originated within the Aragonese Pyrenees region in Spain. He has descended from ancient livestock guardian dogs that have Mastiffs in their ancestry. The Pyrenean Mastiff is a large mountain breed that has been used as livestock guardians since the 1200s. Many researchers believe that the ancestors of the Pyrenean Mastiff were brought into Spain from Assyria and Sumeria by the Phoenicians. The breed slowly developed to be protectors of flocks and companions for the shepherds. He was expected to take on large predators and keep the flock safe from harm. Even though he is a large breed, the Pyrenean Mastiff is light on his feet and able to travel long distances with his flock. It is thought that the Pyrenean Mastiff worked as livestock guardian dogs and protected flocks of merino sheep up and down the Spanish side of the Pyrenean Mountains. The largest number of Pyrenean Mastiffs could be found north of the Ebro River with the Spanish Mastiff being developed and located south of the Ebro River. These two breeds have remained separate even though they lived within close proximity to each other. The breed faced extinction in the 1940s when shipping sheep by rail became more economical and the World Wars had already depleted their numbers. There is not much known about his exact origins since there is little documentation until 1977 when the Club de Mastin del Pirineo de Espana began researching the breed. The breed has been sequestered within the Aragonese Pyrenees region. This made it easier to ensure the purity of the breed. He was not removed from his native region until the late 1970s and early 1980s. He was officially recognized by the Federation Cynologique Internationale in 1982. The Kennel Club first recognized the Pyrenean Mastiff as the Mastin del Pireneo in 2001. The American Kennel Club accepted the Pyrenean Mastiff as a member of its Foundation Stock Service in 2014.

Pyrenean Mastiff Breed Appearance

The Pyrenean Mastiff has a thick, double coat that does shed regularly. His coat is very dense and long and will tangle and matt easily. His coat is shorter on his head and legs, it is thicker around his chest and neck as well as longer feathering on the backs of his legs. He has a thick tail with short, dense hair. He can be found in several different colors; however his base color is always white. Acceptable colors for the conformation ring include white and beige, white and biscuit, white and black, white and brown, white and golden, white and gray, white and sable merle, and white and silver. The Pyrenean Mastiff has dark, almond shaped eyes and a large black nose. He has hanging ears that are triangular in shape. He has a large head and is heavily boned. The Pyrenean Mastiff has a muscular chest and thick neck. For being such a large dog, he is light on his feet and agile. 

Eye Color Possibilities
brown Pyrenean Mastiff eyes
Nose Color Possibilities
black Pyrenean Mastiff nose
Coat Color Possibilities
pied Pyrenean Mastiff coat
white Pyrenean Mastiff coat
Coat Length
Short Medium Long
Coat Density
coat density
Sparse Normal Dense
Coat Texture
coat texture
Pyrenean Mastiff straight coat texture
Straight Wiry Wavy Curly Corded

Pyrenean Mastiff Breed Maintenance

The Pyrenean Mastiff is not a hypoallergenic breed and continually sheds. Dogs that are being exhibited in conformation shows should be groomed several times a week. Dogs that are strictly family companions or working dogs should be groomed at least once a week. His coat will tangle and matt easily, therefore, using a pin brush, metal comb, de-tangling spray and even a dematter may be necessary to keep his coat free of shedding and tangles. Because his coat is very dense, it may take a while to groom completely through him; however, this is necessary to minimize the amount of shedding. The hair between his foot pads should be trimmed every few weeks, especially if he is out in the fields working and can pick up dirt and debris between his pads. Because he is a Mastiff breed, there will be drooling, especially after eating or drinking. The Pyrenean Mastiff does not need bathed often, usually only a few times a year.

Brushes for Pyrenean Mastiff
Pin Brush
Pin Brush
Brushing Frequency
fur daily fur weekly fur monthly
Pyrenean Mastiff requires weekly brushing
Daily Weekly Monthly

Pyrenean Mastiff Temperament

The Pyrenean Mastiff can be hard to control at times due to his large size. He can be intimidating to some people who are not familiar with large breed dogs. As a livestock guardian dog, he will be protective of his home and his family. Training and socialization should be started at a young age to ensure he does not become shy or overly aggressive when meeting strangers. He is generally a mild mannered dog and easy to train, however, there must be a strong leader within the family to train him or he will try to take that position. He does well with children as long as they respect his space and he does excellent with other animals. He may need to be watched around other dogs, especially of the same gender. The Pyrenean Mastiff does require a job to do to keep him happy. He can easily become destructive if he has no outlet for his energy. 

Activity Level
low activity medium activity high activity
Low Medium High
Rec. Walk Mileage Per Week
10 miles
walk mileage
Minutes of Activity Per Day
60 minutes
activity minutes

Pyrenean Mastiff Food Consumption

Cups Per Day
3 cups
cup per day cost cup per day cost cup per day cost
Daily Cost
$1.50 - $1.90
food bowls daily cost
Monthly Cost
$39.00 - $52.00
food bag monthly cost

Pyrenean Mastiff Height & Weight

6 Months
Male Pyrenean Mastiff size stats at six months
Height: 23.0 inches Weight: 80.0 lbs
Female Pyrenean Mastiff size stats at six months
Height: 21.0 inches Weight: 70.0 lbs
12 Months
Male Pyrenean Mastiff size stats at 12 months
Height: 25.5 inches Weight: 110.0 lbs
Female Pyrenean Mastiff size stats at 12 months
Height: 23.0 inches Weight: 100.0 lbs
18 Months
Male Pyrenean Mastiff size stats at 18 months
Height: 28.0 inches Weight: 160.0 lbs
Female Pyrenean Mastiff size stats at 18 months
Height: 25.5 inches Weight: 150.0 lbs

Pyrenean Mastiff Owner Experiences

3 Years
2 People
teasing other household members
We Absolutely Love Her!!!
2 years, 6 months ago
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