Bullmastiff puppy growth: milestones and weight estimates
How fast a Bullmastiff puppy grows, illustrative weight estimates and the limits of predicting adult size.
Bullmastiff puppies grow at a startling rate, often gaining 1.5 to 2.5 kg a week at their peak and reaching around 30 to 40 kg by six months. Height comes first, usually by 12 to 15 months, while the chest, head and muscle keep developing until roughly 2.5 to 3 years.
A Bullmastiff puppy needs an exercise plan matched to its individual development, not an age multiplied by five minutes. Avoid forced running and repetitive high-impact activity while growing, and ask your vet about suitable movement, feeding and body condition. Pain, limping or difficulty getting up needs veterinary attention rather than a harder fitness routine.
Bullmastiff puppy growth in numbers
Illustrative size-based model for a male Bullmastiff, in kg, by age in months
| Age | Female | Male |
|---|---|---|
| 2 months | 4.4 kg | 4.8 kg |
| 3 months | 7.2 kg | 8 kg |
| 4 months | 11 kg | 12 kg |
| 5 months | 15 kg | 16.5 kg |
| 6 months | 18.5 kg | 20.5 kg |
| 7 months | 21.5 kg | 24 kg |
| 8 months | 24.5 kg | 27 kg |
| 9 months | 27.5 kg | 30 kg |
| 10 months | 30 kg | 33 kg |
| 12 months | 34.5 kg | 38 kg |
| 14 months | 38.5 kg | 42 kg |
| 16 months | 41.5 kg | 45.5 kg |
| 18 months | 43.5 kg | 48 kg |
| 21 months | 46.5 kg | 51 kg |
| 24 months | 48 kg | 53 kg |
| 30 months | 49.5 kg | 54.5 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.