How long does a Neapolitan Mastiff live?

The listed lifespan for a Neapolitan Mastiff is 7–9 years.

How tall is a Neapolitan Mastiff?

The listed height for a Neapolitan Mastiff is 26–31 in (male), 24–29 in (female).

Is a Neapolitan Mastiff good with children?

The AKC good-with-children score for a Neapolitan Mastiff is 3 out of 5.

When is a Neapolitan Mastiff full grown?

The growth size band for a Neapolitan Mastiff is up to 24 months.

Working Group

Neapolitan Mastiff

Neapolitan Mastiff is a giant dog in the Working Group. Adult weight is 150 lb (male), 110 lb (female), height is 26–31 in (male), 24–29 in (female), and the listed lifespan is 7–9 years. AKC describes the temperament as Dignified, Loyal, Watchful.

Last reviewed November 1, 2026.

Neapolitan Mastiff dog — Photo: gomagoti · CC BY-SA 2.0 · Wikimedia Commons

Lifespan7–9 years

Weight150 lb (male), 110 lb (female)

SizeGiant GroupWorking Group

Height

26–31 in (male), 24–29 in (female)

Energy

2 / 5

Shedding

3 / 5

Grooming

2 / 5

Trainability

3 / 5

Good with kids

3 / 5

The breed record

Across 36 single-size giant breeds, a lifespan midpoint of 8 years is about 2.2 years shorter than the 10.2-year average. A midpoint adult weight of 130 lb is about 14 lb heavier than the 116 lb average for those giant breeds.

The listed origin is Italy. The coat is described as smooth, short. The AKC energy score is 2 out of 5, 1.7 points below the group average of 3.7 for the Working Group. Shedding scores 3 out of 5. Grooming scores 2 out of 5, so home brushing covers most weeks. Trainability scores 3 out of 5. Good with children scores 3 out of 5. Good with other dogs scores 3 out of 5. AKC ranked this breed number 119 in 2025.

Adult size is usually reached in up to 24 months (size-band statement (Salt et al. 2017): larger breeds require up to 24 months). AKC parent-club recommended health screenings: Hip Evaluation, Elbow Evaluation, Cardiac Exam, and Ophthalmologist Exam. These are screening tests, not a list of diseases the breed is guaranteed to develop.

Frequently asked

Questions from the breed record

The verified adult weight for a Neapolitan Mastiff is 150 lb (male), 110 lb (female).

Sources

More Working Group breeds

All Working Group breeds

Anatolian Shepherd Dog
110–150 lb (male), 80–120 lb (female) · 11–13 years
Open breed
Newfoundland
130–150 lb (male), 100–120 lb (female) · 9–10 years
Open breed
Tibetan Mastiff
90–150 lb (male), 70–120 lb (female) · 10–12 years
Open breed
Greater Swiss Mountain Dog
115–140 lb (male), 85–110 lb (female) · 8–11 years
Open breed