Quick Take
- A successful owner must manage a 100-pound weight gain within the first 6 months.
- The 160-pound frame necessitates a strict 10-year age restriction for any unsupervised children.
- These 1,100-year legacy alphas possess a calm nature that many owners mistake for laziness.
- Breeders must prioritize crush prevention protocols for 1-pound newborns to ensure litter survival.
The history of the Spanish Mastiff goes back 1,100 years to the 10th century, when shepherds began using them to defend migrating herds against grey wolves and other predators. Spanish Mastiffs are powerful canines with long legs, heavy bones, and muscular bodies, but they have surprisingly docile temperaments. In their homeland, Spain, they are also known as the Mastín Español and Mastín de España. The American Kennel Club classifies these canines as working dogs.
While these dogs are good-natured and exceedingly intelligent, they can be hard to train because they’re firmly convinced that they are the true alphas of any group they’re in, and it can be hard to disabuse them of this notion. For that reason, they don’t make great pets for first-time dog owners. Spanish Mastiffs are Spain’s national dog; approximately 24,000 of them live in their native country, but there aren’t very many of these dogs outside Spain.
3 Pros And Cons Of Owning a Spanish Mastiff
| Pros | Cons |
|---|---|
| They’re very calm: These dogs are so laid-back that it’s easy to dismiss them as lazy. This is not actually the case, though. You’ll be amazed by how quick and agile they can be when you’re playing catch with them, or if they sense something they perceive as a threat to their loved ones. | They drool a lot: All mastiffs drool more than other dogs because saliva tends to accumulate in their oversized jowls. The Spanish Mastiff is most likely to slobber after exercise, or after eating or drinking. Keep a clean rag handy at all times. |
| They’re very calm: These dogs are so laid-back that it’s easy to dismiss them as lazy. This is not actually the case, though. You’ll be amazed by how quick and agile they can be when you’re playing catch with them or if they sense something they perceive as a threat to their loved ones. | They occupy a lot of space: Spanish Mastiffs are big dogs. Even when they’re on their best behavior, their enormous size can pose a hazard to children, the elderly, and the disabled. If you live in an apartment, this is not the pet for you. |
| They make great watchdogs: They don’t bark a lot, but that doesn’t mean they’re not on the lookout for anything that might possibly menace their owner. With this massive canine by your side, you can walk the streets at 3 a.m. without fear. | They shed a lot: These dogs have dense double coats, which they shed twice a year in the spring and the fall. If you’re looking for a hypoallergenic pet, consider another breed. |

Spanish Mastiff can be found in a heavy and light version.
©LFRabanedo/Shutterstock.com
Types Of The Breed
The Spanish mastiff comes in two different types — the Heavy Mastiff (Mastin Pescado) and the Light Mastiff (Mastin Ligero). The Pescado, the larger of the two, is a bigger and heavier mountain type of dog, while the Ligero is a more refined, lighter steppe variety.
Size And Weight
Spanish Mastiffs are enormous dogs. Adult males stand 30 to 35 inches tall and weigh anywhere between 160 and 220 pounds. Adult females are significantly smaller; they range in height between 28 and 35 inches, and they weigh between 110 and 170 pounds.
Puppies are just under a pound when they are born, but if they receive proper nutrition, they grow quickly. By three weeks of age, males may weigh as much as 15 pounds, and females may weigh as much as 13 pounds. By six months of age, males may weigh as much as 100 pounds, and females may weigh as much as 90 pounds. These dogs typically reach their adult height and weight between 12 and 18 months of age.
Common Health Issues

Spanish Mastiffs are prone to obesity and musculoskeletal problems.
©Sergey Lavrentev/Shutterstock.com
The typical lifespan of these dogs is 10 to 12 years. Obesity can be a significant issue with these canines, particularly if you don’t make a point of implementing a healthy eating routine with your pet while he or she is a puppy. You don’t want to encourage these dogs to beg for table scraps.
Like other large dogs, they are prone to musculoskeletal problems that include hip dysplasia and elbow dysplasia. Immature dogs can also be affected by eosinophilic panosteitis, which is a painful inflammation of the long bones in the legs. If this condition commences, you’ll begin seeing it when your puppy is between six and 10 months old. While eosinophilic panosteitis doesn’t cause permanent damage, it can be extremely painful and cause your dog to walk with a limping gait.
Because they drool so much, they are also prone to developing dental disease. If you own this breed, it is essential to brush your dog’s teeth regularly at home and to bring him or her to the vet for regular teeth cleanings.
Temperament

Spanish Mastiff dogs are very relaxed and mellow, but do best in a one-dog household.
©Alberto Duran Photography/Shutterstock.com
These dogs have placid, mellow temperaments. Their personalities are very relaxed, so long as they don’t feel like they have to compete for their owner’s attention. Territoriality is a strong behavioral trait in them, however. While they can be socialized to share the roost with another dog or even a cat, they prefer not to. They do best as only dogs.
Though loving and loyal, Spanish Mastiffs are independent dogs. They don’t mind spending time by themselves. They’re very intelligent, and this means that if they are not trained well, they may get into mischief if they’re off enjoying time on their own. They naturally assume that they’re the leader of the pack, and it is up to you, as the owner, to teach them differently.
How To Take Care Of Spanish Mastiffs
Because of their huge size, these dogs have some specialized needs when it comes to diet and exercise. Their short, dense double coats require some specific types of attention as well. Here are some tips for the types of care that will keep your dog healthy and happy.
The Best Dog Food
These dogs typically consume four cups of high-quality kibble a day. As big dogs, they have a tendency toward bloat, so it’s safest to divide their feedings into at least two meals a day. Because they are prone to dental issues, definitely opt for dry dog food as opposed to wet/canned.
Maintenance And Grooming
These dogs have a dense, medium-length double coat and are prone to shedding. If you don’t want to add dog hair to your indoor decorating scheme, they need to be brushed at least twice a week vigorously with a pin brush and a metal comb. During the spring and fall, when they shed their coats, you may need to brush them daily.
Their nails are strong and grow quickly, so you’ll need to trim them regularly to prevent overgrowth and splitting. Their long, flat ears need to be checked for mites and cleaned regularly, too. As an excessive drooler, this breed is prone to dental disease, so brushing your dog’s teeth several times a week is highly recommended.
Training

Spanish Mastiffs are very stubborn and prefer to think for themselves. Early training is important.
©Sergey Lavrentev/Shutterstock.com
They are very smart dogs, but training can be a challenge, particularly for inexperienced dog owners. These dogs prefer to think for themselves, and they’re very stubborn. You’ll need to begin training and socialization activities early and reinforce that training over the course of their adult lifespan. Socialization is particularly important because its large size means that it can cause damage without intending to. Spanish Mastiffs respond best to positive reinforcement. They’re especially motivated by treats.
Exercise
Despite their size, Spanish Mastiffs are not high-energy dogs. Left to their own devices, many of them would cheerfully forgo exercise. A responsible Spanish Mastiff owner will not allow this, though. Plan on taking your dog for at least one 45-minute walk a day. Spanish Mastiffs are most active in their young adulthood, so they may need additional exercise during this time.
Puppies

Spanish Mastiff puppies retain their puppy behavior well into their third year.
©Utekhina Anna/Shutterstock.com
Spanish Mastiffs retain many of their puppy-like behavior well into the third year of their lives. They typically have large litters of up to 10 puppies, and since they only weigh one pound at birth, breeders must take particular care to prevent a mother from inadvertently squashing and injuring her pups. It’s extremely important to feed a puppy specially formulated food so that he or she doesn’t grow too fast, which will place excessive strain on their joints.
Spanish Mastiff And Children
These dogs love children, and children love Spanish Mastiffs. Problems arise, however, when your dog forgets how big it is and accidentally causes a small child injury. This is one of the reasons why socialization is so important for this breed. Even with a well-socialized Spanish Mastiff, it’s wisest never to leave them unsupervised around children younger than 10 years old.
Dogs Similar To Spanish Mastiffs
Great Danes, Neapolitan Mastiffs, and Tibetan Mastiffs share traits in common with these dogs.
- Great Danes: Like Spanish Mastiffs, Great Danes have affectionate natures and drool a lot. Though they are big dogs and measure up to Spanish Mastiffs in height, they only weigh about half what a Spanish Mastiff weighs. Their lifespans are generally shorter than the lifespans of Spanish Mastiffs.
- Neapolitan Mastiffs: Neapolitan Mastiffs are similar in size and weight to Spanish Mastiffs, but while both breeds are protective, Neapolitan Mastiffs are known for their loyalty and calm demeanor rather than increased aggression.
- Tibetan Mastiffs: Tibetan Mastiffs aren’t quite as large as Spanish Mastiffs. Though they were bred to protect livestock, DNA studies have confirmed that they’re not true mastiffs but are more closely related to mountain dogs like St. Bernards.
Spanish Mastiff Pictures
View all of our Spanish Mastiff pictures in the gallery.
Sergey Lavrentev/Shutterstock.com
Sources
- Dog Time / Accessed August 1, 2021
- Wag Walking / Accessed August 1, 2021
- American Kennel Club / Accessed August 1, 2021
- Aubrey Animal Medical Center / Accessed August 1, 2021
- Wikipedia / Accessed August 1, 2021
- The Happy Puppy Site / Accessed August 1, 2021
- American Kennel Association / Accessed August 1, 2021
- Mastiff Guide / Accessed August 1, 2021