Neapolitan Mastiff puppy growth: milestones and weight estimates
How fast a Neapolitan Mastiff puppy grows, illustrative weight estimates and the limits of predicting adult size.
Neo puppies grow at a remarkable rate. A 10-week-old puppy may weigh 10 to 13 kg, and many pass 40 kg by 6 months. Height is mostly reached by about 18 months, but the chest, head and bone keep developing until 2 or even 3 years.
Slow, steady growth is the goal. Feed a large or giant-breed puppy food, measure every meal and avoid supplements unless your vet advises them. Keep exercise short and on soft ground, avoid stairs and jumping, and do not let a puppy wrestle with bigger adult dogs. Limping, reluctance to rise, or swollen joints in a growing Neo should be checked by a vet without delay.
Neapolitan Mastiff puppy growth in numbers
Illustrative size-based model for a male Neapolitan Mastiff, in kg, by age in months
| Age | Female | Male |
|---|---|---|
| 2 months | 4.8 kg | 5.7 kg |
| 3 months | 8 kg | 9.5 kg |
| 4 months | 12 kg | 14.5 kg |
| 5 months | 16.5 kg | 19.5 kg |
| 6 months | 20.5 kg | 24 kg |
| 7 months | 24 kg | 28.5 kg |
| 8 months | 27.5 kg | 32.5 kg |
| 9 months | 30.5 kg | 36 kg |
| 10 months | 33.5 kg | 39.5 kg |
| 12 months | 38.5 kg | 45.5 kg |
| 14 months | 42.5 kg | 50.5 kg |
| 16 months | 46 kg | 54 kg |
| 18 months | 48.5 kg | 57.5 kg |
| 21 months | 51.5 kg | 61 kg |
| 24 months | 53 kg | 63 kg |
| 30 months | 55 kg | 65 kg |
This is an editorial model scaled to a typical adult weight, not an observed breed average, a validated growth standard or a healthy-weight range. Do not adjust food to make a puppy follow this line. Discuss actual growth measurements with your vet.