Bullmastiff: Weight charts, life expectancy, size, and more

Discover everything about the Bullmastiff, including weight charts, weight progressions of registered dogs, life expectancy, size, and other useful information.

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Head of the dog breed Bullmastiff
  • 61 - 66 cm
  • 99 - 119 lbs
  • 8 - 10 years
  • from 19 months
  • 64 - 68 cm
  • 110 - 130 lbs
  • 8 - 10 years
  • from 20 months

Size, development and life expectancy of Bullmastiffs

The Bullmastiff is one of the large dog breeds. As soon as he is fully grown after a maximum of 22 months, the Bullmastiff reaches an impressive size of 61 - 68 cm.

The Bullmastiff is characterized by an average life expectancy of 8 - 10 years. This makes it one of the dog breeds with a typical lifespan. The final weight varies depending on gender, ranging between 99.2 - 130.1 lbs. Male Bullmastiffs are usually around 11 lbs heavier than females.

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Male Weight Curve: Development of the Bullmastiff from 2 to 22 Months

A male Bullmastiff reaches an impressive weight of 33,8 lbs after only 3 months, exceeding the weight of many adult dog breeds. At the age of half a year, the weight increases rapidly to 73,4 lbs. After the rapid growth phase, the Bullmastiff grows another 14 months and finally reaches a final weight of 110.2 - 130.1 lbs.

Age Weight
2 Month 17.86 lbs
3 Month 34.72 lbs
4 Month 50.04 lbs
5 Month 64.82 lbs
6 Month 78.48 lbs
7 Month 83.44 lbs
8 Month 88.07 lbs
9 Month 93.26 lbs
10 Month 97.00 lbs
11 Month 100.75 lbs
12 Month 104.28 lbs
13 Month 108.03 lbs
14 Month 111.44 lbs
15 Month 114.42 lbs
16 Month 117.18 lbs
17 Month 119.93 lbs
18 Month 121.81 lbs
19 Month 123.68 lbs
20 Month 125.66 lbs
21 Month 127.54 lbs
22 Month 129.52 lbs
23 Month 130.07 lbs

Female Weight Curve: Development of the Bullmastiff from 2 to 22 Months

Female dogs of the dog breed Bullmastiff are also among the heavier dog breeds. They reach a weight of 31,1 lbs after 3 months. Another 3 months later, they weigh an average of 66,1 lbs. After an additional 13 months, Bullmastiff females ultimately reach their final weight of 99.2 - 119.0 lbs.

Age Weight
2 Month 17.20 lbs
3 Month 31.31 lbs
4 Month 45.42 lbs
5 Month 57.98 lbs
6 Month 70.11 lbs
7 Month 74.52 lbs
8 Month 78.93 lbs
9 Month 82.89 lbs
10 Month 86.42 lbs
11 Month 90.17 lbs
12 Month 93.48 lbs
13 Month 96.78 lbs
14 Month 99.21 lbs
15 Month 101.85 lbs
16 Month 104.28 lbs
17 Month 106.70 lbs
18 Month 108.69 lbs
19 Month 110.45 lbs
20 Month 112.44 lbs
21 Month 114.64 lbs
22 Month 116.84 lbs
23 Month 119.05 lbs
Registered dog named 'Abby' Registered dog named 'BamBam' Registered dog named 'Ivy' Registered dog named 'Vahile'

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Precise prediction of the final weight of Bullmastiffs

Calculate the final weight for Bullmastiff puppies and young dogs

Do you want to know how big your Bullmastiff puppy will eventually become? With our special dog growth calculator, you can accurately calculate the end weight of the Bullmastiff breed. Whether you currently have an adorable Bullmastiff puppy or your young dog is growing up, our user-friendly tool provides you with valuable information.

Dog Weight Calculator

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Last weighings of registered Bullmastiff owners

Register now for free and get access to all 88 registered dogs of the breed Bullmastiff!

Bullmastiff
Rufus
Dog breed Rufus
  • Weight:
    88 lbs
  • Age:
    6 months
  • Gender:
    Male Dog
Bullmastiff
Lili
Dog breed Lili
  • Weight:
    73 lbs
  • Age:
    6 months
  • Gender:
    Female Dog
Bullmastiff
Gaia
Dog breed Gaia
  • Weight:
    120 lbs
  • Age:
    1 years, 7 months
  • Gender:
    Female Dog
Bullmastiff
Bob
Dog breed Bob
  • Weight:
    66 lbs
  • Age:
    7 months
  • Gender:
    Male Dog
Bullmastiff
Zar
Dog breed Zar
  • Weight:
    27 lbs
  • Age:
    5 months
  • Gender:
    Female Dog
Bullmastiff
Kyra
Dog breed Kyra
  • Weight:
    120 lbs
  • Age:
    10 years, 9 months
  • Gender:
    Female Dog
Bullmastiff
Fien
Dog breed Fien
  • Weight:
    47 lbs
  • Age:
    8 months
  • Gender:
    Female Dog
Bullmastiff
Loena
Dog breed Loena
  • Weight:
    27 lbs
  • Age:
    6 months
  • Gender:
    Female Dog
Bullmastiff
Hugo
Dog breed Hugo
  • Weight:
    119 lbs
  • Age:
    1 years, 2 months
  • Gender:
    Male Dog
Bullmastiff
Gia
Dog breed Gia
  • Weight:
    88 lbs
  • Age:
    1 years, 2 months
  • Gender:
    Female Dog

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Bullmastiff: Frequently asked questions about the dog breed

How much does a Bullmastiff puppy weigh?

Typically, a Bullmastiff puppy weighs around 17,2 - 33,8 lbs at 2 months old and continues to gain an additional 30,20 lbs over the next 2 months. By approximately 18 weeks, when the puppy reaches the adolescent stage, a Bullmastiff puppy weighs about 44,2 - 61,1 lbs.

What is the typical size of a Bullmastiff?

The size of an Bullmastiff can vary depending on gender and genetics. Generally, male Bullmastiffs reach a shoulder height of approximately 66 cm, while females have an average shoulder height of around 63.5 cm.

When is the dog breed Bullmastiff fully grown?

The dog breed Bullmastiff usually reaches full physical maturity at about 20 to 22 months of age. However, this may vary from individual to individual, as each dog has its own growth rate.

What is the average weight of a fully grown Bullmastiff?

The weight of a fully grown Bullmastiff dog can vary depending on factors such as gender and genetics. On average, male dogs of this breed typically weigh between 110.2 - 130.1 lbs. Female dogs, on the other hand, usually have a weight range of 99.2 - 119.0 lbs.

What is the average lifespan of a Bullmastiff dog?

Bullmastiffs generally have a life expectancy of approximately 8 to 10 years. With proper care, nutrition, and regular veterinary attention, they can lead happy and healthy lives.