American Mastiff

Breed Information


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American Mastiff

Other names

AM Mastiff


United States

Breed Group





Life Span

10-12 years









28-36 inches (65-91 cm)


Male: 160-200 pounds (72-90 kg)

Female: 140-180 pounds (63-81 kg)


Apricot, White, Brindle, Fawn

Litter Size

2-5 puppies

Puppy Prices

Average $1000 – $1500 USD

Disclaimer: While the characteristics mentioned here may frequently represent this breed, dogs are individuals whose personalities and appearances will vary. Please consult the adoption organization for details on a specific pet.

Breed Characteristics



Apartment Friendly


Barking Tendencies


How often this breed vocalizes, whether it’s with barks or howls. While some breeds will bark at every passer-by or bird in the window, others will only bark in particular situations. Some barkless breeds can still be vocal, using other sounds to express themselves.

Cat Friendly


Child Friendly


A breed’s level of tolerance and patience with childrens’ behavior, and overall family-friendly nature. Dogs should always be supervised around young children, or children of any age who have little exposure to dogs.

Dog Friendly


Exercise Needs


Bred to be guardians of ‘hearth and home’ Mastiffs have comparatively low exercise requirements and can live happily in an apartment. They benefit physically and psychologically from free play and daily walks’ a mile or two for adult Mastiffs. However, owners must be careful not to overtax growing puppies and young adults: Don’t allow them to run up and down stairs, jump from heights, or engage in long walks. Begin with no more than half a block for a 2- to 3-month-old puppy. Additionally, Mastiffs are notorious for plopping down during walks when they are tired or overheated. Therefore, a rule of thumb is to not walk them farther than you can carry them back!



How frequently a breed requires bathing, brushing, trimming, or other kinds of coat maintenance. Consider how much time, patience, and budget you have for this type of care when looking at the grooming effort needed. All breeds require regular nail trimming.

Health Issues


How much mental stimulation a breed needs to stay happy and healthy. Purpose-bred dogs can have jobs that require decision-making, problem-solving, concentration, or other qualities, and without the brain exercise they need, they’ll create their own projects to keep their minds busy — and they probably won’t be the kind of projects you’d like.





Shedding Level


How much fur and hair you can expect the breed to leave behind. Breeds with high shedding will need to be brushed more frequently, are more likely to trigger certain types of allergies, and are more likely to require more consistent vacuuming and lint-rolling.

Stranger Friendly




How easy it will be to train your dog, and how willing your dog will be to learn new things. Some breeds just want to make their owner proud, while others prefer to do what they want, when they want to, wherever they want!

Watchdog Ability


The American Mastiff is a remarkable canine breed known for its imposing presence and gentle nature. If you’re considering welcoming one into your family, understanding their distinctive characteristics is essential. In this article, we’ll delve into the American Mastiff dog breed characteristics, shedding light on their appearance, temperament, training needs, health considerations, and more. Let’s embark on a journey to discover what makes the American Mastiff a truly majestic companion.

American Mastiff Dog Breed Characteristics

The American Mastiff Dog Breed Characteristics showcase a blend of power and gentleness that sets them apart from other breeds. These traits contribute to their unique identity and suitability as family pets.

Sturdy Build and Impressive Size

The American Mastiff is known for its large and muscular build. Males typically weigh between 160 to 200 pounds, while females weigh slightly less at 140 to 180 pounds. Standing around 28 to 36 inches at the shoulder, their impressive size commands attention and exudes strength.

Distinctive Appearance

With a short coat that can be fawn, apricot, or brindle in color, the American Mastiff boasts a dignified appearance. Their black mask adds to their distinct look, highlighting their expressive eyes. Their appearance strikes a balance between elegance and power.

Gentle and Calm Temperament

Contrary to their imposing stature, American Mastiffs are known for their gentle and calm temperament. They are often referred to as “gentle giants.” Their affectionate nature makes them excellent companions for families, and their patience is particularly noteworthy around children.

Loyal and Protective

One of the remarkable American Mastiff dog breed characteristics is their loyalty and protective instinct. They form strong bonds with their families and are vigilant guardians. This protective nature extends to their home and loved ones, making them an excellent choice for those seeking a devoted guardian.

Minimal Exercise Requirements

Despite their size, American Mastiffs have moderate exercise requirements. Regular walks and playtime are essential, but they are not excessively active dogs. This trait makes them suitable for households with varying activity levels.

Training and Socialization

Early training and socialization are crucial for American Mastiffs due to their protective nature. Positive reinforcement techniques work best, as they respond well to praise and treats. Ensuring they are well-mannered from a young age is essential given their size.

Low Shedding Coat

Another appealing aspect of American Mastiffs is their low shedding coat. While they do shed, it’s not as excessive as some other breeds. Regular grooming and brushing help keep their coat healthy and minimize shedding.

Potential Health Considerations

Like all breeds, American Mastiffs have specific health considerations to be aware of. These may include joint issues, bloat, and heart conditions. Regular veterinary check-ups and a healthy diet can help mitigate potential health risks.


In conclusion, the American Mastiff dog breed characteristics encompass a harmonious blend of strength, loyalty, and gentleness. Their imposing size is matched by their calm temperament, making them an ideal choice for families seeking a protective yet affectionate companion. By understanding their unique traits and meeting their specific needs, you can enjoy a fulfilling and enriching relationship with this majestic breed.

Remember, welcoming an American Mastiff into your life requires commitment, dedication, and responsible ownership. But the rewards of having such a devoted and loving companion by your side are immeasurable.


Are American Mastiffs good family pets?

Absolutely, American Mastiffs are excellent family pets due to their gentle, loyal, and protective nature. They get along well with children and can form strong bonds with all family members.

How much exercise do American Mastiffs need?

Despite their size, American Mastiffs have moderate exercise needs. Daily walks and playtime are essential to keep them healthy and mentally stimulated.

Do American Mastiffs get along with other pets?

With proper socialization, American Mastiffs can coexist with other pets. Early introduction and training are key to fostering positive interactions.

Are American Mastiffs easy to train?

Yes, American Mastiffs are intelligent and eager to please, making them relatively easy to train. Positive reinforcement methods work best, and starting training early is recommended.

Do American Mastiffs require a lot of grooming?

No, American Mastiffs have a short coat that requires minimal grooming. Regular brushing helps keep their coat healthy and reduces shedding.

What is the average lifespan of an American Mastiff?

The average lifespan of an American Mastiff is around 10 to 12 years. Providing them with proper care, a balanced diet, and regular exercise can contribute to their longevity.

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