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🐶 Dog · size Large

Mastiff

Large dog breed with unique character.

Photo · Geoff Dunkleberger (CC BY-SA 4.0)

Weight

70–100 kg

Size

Large

Lifespan

8–12 ans

Energy

Élevé

Origin

Royaume-Uni}}

Coat

fawn, apricot, brindle

Maintenance

Moyen

Training

Moyen

The Mastiff, abbreviation of English "Old English Mastiff", is a dog breed. Its name "Mastiff" comes from "masty" which means "powerful". In the Cynographia Britannica, it is said: "What the Lion is to the Cat the Mastiff is to the Dog" ("What the Lion is to the Cat the Mastiff is to the Dog"). In terms of mass, it is one of the largest dog breeds, although exceeded in size by the Irish Wolfhound and the Great Dane.

Compatibility

With childrenApartmentOther animals

Profile

At a glance

Energy

Élevé

Trainability

Modéré

Maintenance

Modéré


With children
Apartment×
Other pets×

Indicative profile — every animal is an individual.

⚡ Key facts in 30 seconds

L'essentiel

  • 1Large breed (70–100 kg): plan for space, exercise, and food budget.
  • 2Lifespan: 8 to 12 years on average, depending on maintenance and diet.
  • 3High energy level — at least 1 hour of activity per day for balance.
  • 4Moderate maintenance — weekly brushing is sufficient.
  • 5Documented predispositions: cardiomyopathy, dysplasia. Veterinary monitoring recommended.

Chapter 1

Getting to know the Mastiff

Character

Daily temperament

These are dogs with naturally good character, placid and strangely gentle. It is a dog that enjoys in an apartment, as in the countryside, it curiously does not take up much space, only asking for the complete attention of its masters (it cannot tolerate solitude). Mastiffs, however, need exercise and activities every day to keep them in shape, although they sometimes prefer to sit rather than run after the ball you throw them (especially if you throw it far). Suspicious of strangers, it is a good guard. Its mere presence in a garden is enough to intimidate. It is a dog that learns very quickly and whose training happens naturally, because that is how its temperament is. You get nothing from this dog by showing brutality, it only understands gentleness. Raising your voice immediately puts it off and it is no longer possible to get anything from it for a long time. It is a generally tender dog with children, but which does not know its strength and which can be rough without intending to. Despite its gentleness and kindness of soul, it is a dog with enormous physical strength that can be hard to hold on a leash.

Chapter 2

Daily life

What if you adopted your future companion?

The Mastiff of your dreams may already be waiting in a shelter. Hundreds of mastiff (and equally wonderful crossbreeds) are looking for a family in France — every adoption starts a new story.

Editorial recommendation — no affiliate links.

Âge

What human age for a mastiff ?

The calculator is already set to the breed's adult size (espérance de vie 8–12 ans). Drag the slider to see the equivalence and corresponding life stage.

3 years
Birth22 years
Adult size

plus de 44 kg — a giant dog ages significantly faster than a small dog after maturity.

Equivalent human age

31years

Adulte

Most stable period. Monthly weigh-in, annual vet visit, dental care — this determines quality of life in later years.

Method: AVMA table: 15 human years in year one, +9 in year two, then +7 per year for a géant dog.

These equivalences are statistical benchmarks drawn from published veterinary tables. Every animal ages at its own pace, depending on genetics, diet and care. This calculator is neither a diagnosis nor veterinary advice.

Health

Health watch

Documented predispositions

cardiomyopathie · dysplasie — adjust diet and veterinary checks.

🐾 Products suited to this breed

Alert

To avoid for dog

Our database lists toxic ingredients and problematic additives by species.

  • low-fat cocoa powderModerate
  • maltitolModerate
  • cocoa pasteModerate
  • onion piecesModerate

Calculator · daily ration

How much to give a mastiff ?

Estimate based on the veterinary formula RER × DER, adjusted for dog. Adjust according to package recommendations.

85 kg
70 kg110 kg
Moderate

Result

722 g

per day · 2743 kcal

361 g / repas (2 par jour)

Calculation for food of 380 kcal/100g.

For an exact calculation for your Mastiff (breed, age, allergies, health conditions): create a free account

Appears in

Mastiff in our rankings

FAQ

Frequently asked questions about Mastiff

Is a Mastiff suitable for apartment living?+
No, the Mastiff needs space and is happier in a house with outdoor access.
How much exercise does a Mastiff need per day?+
Plan for about 1 hour of daily exercise — brisk walks, play, or canine sports.
What is the lifespan of a Mastiff?+
Between 8 and 12 years on average. Appropriate diet, regular veterinary care, and exercise contribute to a longer life.
Is a Mastiff good with children?+
Yes, the Mastiff is generally known for its compatibility with children. Early socialization and parental supervision remain essential.

If you like this dog

Breeds with similar profiles

For more information

Sources & official links

Supplementary documentation on reference sites — breed clubs, encyclopedias, veterinarians.

The right score for your Mastiff.

SokoScan calculates a personalized PawScore based on breed, age, weight and your pet's sensitivities. Free, instant.