🐕‍🦺 X-Large · Spain

Spanish Mastiff: Size, Weight & Temperament

An enormous Spanish livestock guardian dog of imposing stature, calm and easygoing in daily life but with a pronounced protective and territorial instinct toward perceived threats.

! Experienced only
Spanish Mastiff dog breed portrait
Photo: Pleple2000 · CC BY-SA 3.0 · Wikimedia Commons
Weight male90–120 kg
Weight female70–100 kg
Shoulder height72–88 cm
Size classX-Large (over 45 kg)
Fully grownat approx. 30 months
Life expectancy10–12 years
Activity levelLow
OriginSpain
ClassificationFCI Group 2 – Pinscher and Schnauzer, Molossoid and Swiss Mountain and Cattle Dogs
Temperament & character

The Spanish Mastiff is calm and easygoing day to day and deeply loyal to its family, but becomes decisive and protective when it perceives a threat. It naturally approaches strangers with reserve.

Exercise & stimulation

As a livestock guardian, the breed traditionally moves at a leisurely pace and watches over its territory rather than seeking athletic exertion. Still, it needs daily exercise and sufficient space.

Grooming

The dense coat needs regular brushing, especially during shedding season, and skin folds on the head should be checked for irritation. Given its size, joint-friendly exercise is especially important for puppies.

Suitable for beginners?

Given its size, weight, and protective instinct, it is suitable only for very experienced owners with sufficient space and leadership skills — definitely not for beginners.

Health & common problems

As a giant breed, the Spanish Mastiff is prone to hip and elbow dysplasia, bloat, and heart disease. Its rapid growth as a puppy requires carefully controlled feeding.

Good with: very experienced owners with a large property and a genuine need for livestock guarding

Is your Spanish Mastiff at a healthy weight? Calculate the ideal weight and the right portion size for free in the Souldog app.

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This information is for general guidance and does not replace veterinary or breeder advice. Temperament and health vary individually within every breed.