How big is a Neapolitan Mastiff?
Up to 75 cm (30 in) at the shoulder, per the FCI breed standard: here it is to scale next to a person, with its weight, how long it lives and when it becomes a senior.
To scale, next to a person
Photo: Philip Thompson (CC BY-SA 3.0)
The breed in numbers
- Height
- 65-75 cm
- Weight
- 60-70 kg (132-154 lb)
- Median lifespan
- 9.3 years
- Senior from
- 6-7 years
- FCI group
- pinschers, schnauzers, molossers and Swiss mountain dogs (FCI 197)
- Calories a day
- 2,410 kcal
Frequently asked questions
How tall is a Neapolitan Mastiff?
65 to 75 cm (26 to 30 in) at the shoulder for males, and 60 to 68 cm for females, according to the official FCI breed standard (no. 197).
How much does a Neapolitan Mastiff weigh?
60-70 kg (132-154 lb), according to the official FCI standard.
How long does a Neapolitan Mastiff live?
The median lifespan is 9.3 years, from a 2024 study of 584,734 dogs in the UK (McMillan et al.). Half the dogs of the breed lived longer, half shorter.
When is it a senior?
The AVMA says a dog is a senior in the last quarter of its expected life: for this breed’s weight, from 6–7 years old. From then on, a vet checkup at least twice a year.
How much should it eat?
A spayed or neutered adult weighing 60 kg (132 lb) needs about 2,410 calories a day, by the Pet Nutrition Alliance formula. The amount depends on the calories in its food: work it out from the label.
How old is it in human years?
By the formula from a 2020 DNA study: at 1 year it’s like a 31-year-old person, at 3 like a 49-year-old, at 7 like 62, at 12 like 71. The formula was found in Labradors: for other breeds it’s an estimate.
Compare it with other breeds All 42 breeds All the pets next to a person
For your dog
Always ask your vet: this site helps you understand, it doesn’t replace a checkup.
Sources
- Fédération Cynologique Internationale (FCI), breed standards (checked on October 9, 2026)
- McMillan K. M. et al., “Longevity of companion dog breeds: those at risk from early death,” Scientific Reports 2024 (CC BY 4.0) (checked on October 6, 2026)
- AVMA, “Caring for senior cats and dogs” (checked on October 6, 2026)
- Pet Nutrition Alliance, “Calculating Calories Based on Pet Needs” (checked on October 6, 2026)
- Wang T. et al., “Quantitative Translation of Dog-to-Human Aging by Conserved Remodeling of the DNA Methylome,” Cell Systems 2020 (checked on October 6, 2026)