Neapolitan Mastiff weight by age
Typical weight by age for a Neapolitan Mastiff with an adult weight of about 150 lb (male) or 110 lb (female). The range shows where most puppies fall.
| Age | Male | Female |
|---|---|---|
| 2 months | 24 lbrange 16–31 lb | 17 lbrange 12–23 lb |
| 3 months | 40 lbrange 29–52 lb | 29 lbrange 21–38 lb |
| 4 months | 59 lbrange 45–73 lb | 43 lbrange 33–54 lb |
| 5 months | 80 lbrange 64–97 lb | 59 lbrange 47–71 lb |
| 6 months | 95 lbrange 77–112 lb | 70 lbrange 56–82 lb |
| 8 months | 119 lbrange 99–136 lb | 87 lbrange 73–100 lb |
| 10 months | 130 lbrange 109–146 lb | 95 lbrange 80–107 lb |
| 12 months | 136 lbrange 118–150 lb | 100 lbrange 87–110 lb |
Divide pounds by 2.2 for kilograms.
Adult weight
AKC breed page: 150 pounds (male), 110 pounds (female). The calculator uses about 150 lb for males and 110 lb for females as the typical adult weight.
Common questions
How much should a Neapolitan Mastiff puppy weigh at 3 months?
A typical male Neapolitan Mastiff weighs about 40 lb at 3 months (most between 29 and 52 lb). A typical female weighs about 29 lb (most between 21 and 38 lb).
How much should a Neapolitan Mastiff puppy weigh at 6 months?
A typical male Neapolitan Mastiff weighs about 95 lb at 6 months (most between 77 and 112 lb). A typical female weighs about 70 lb (most between 56 and 82 lb).
How much does a Neapolitan Mastiff weigh at 1 year?
A typical male Neapolitan Mastiff weighs about 136 lb at 12 months (most between 118 and 150 lb). A typical female weighs about 100 lb (most between 87 and 110 lb).
When does a Neapolitan Mastiff stop gaining weight?
The typical Neapolitan Mastiff puppy reaches about 90% of its adult weight around 12 months and 95% around 18 months. Large and giant breeds fill out for longer than small ones.
How accurate is the Neapolitan Mastiff weight calculator?
Across our test dogs the typical miss was about 11% of adult weight, smaller for older puppies. Your puppy can land outside the range. See the methods page.
Other breeds
Weight standard: AKC breed page. Growth curves: our analysis of open data from Salt et al. (2017), CC BY 4.0. An estimate, not veterinary advice. Methods.