Bullmastiff: Dog breed weight & growth

A Bullmastiff is fully grown after a maximum of 22 months. Its final weight is between 99 lbs and 130 lbs, depending on the gender.

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General information about the dog breed Bullmastiff:

Weight, life expectancy, size & more.

Bullmastiff Males:

  • Final weight: 110 lbs - 130 lbs
  • Size: 64 cm - 68 cm
  • Full-grown: from 22 months
  • Life expectancy: 8 - 10 years

Bullmastiff Females:

  • Final weight: 99 lbs - 119 lbs
  • Size: 61 cm - 66 cm
  • Full-grown: from 22 months
  • Life expectancy: 8 - 10 years

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Growth curve of Bullmastiff males:

At the age of 3 months, a Bullmastiff male dog should weigh between 33 - 35 lbs depending on size. At the age of 6 months, the weight of a male dog is normally between 68 - 78 lbs. Already after one year the growth is mostly completed. A Bullmastiff male should now weigh between 91 - 104 lbs at the age of 12 months. Another 10 months later, at the age of 1.8 years, his growth phase is completed and he reaches his final final weight of 110 - 130 lbs.

Compare the chart below, as well as the accompanying growth chart, to your Bullmastiff puppy/dog's weight by registering for free here.

month 2 18 lbs
month 3 35 lbs
month 4 50 lbs
month 5 65 lbs
month 6 78 lbs
month 7 83 lbs
month 8 88 lbs
month 9 93 lbs
month 10 97 lbs
month 11 101 lbs
month 12 104 lbs
month 13 108 lbs
month 14 111 lbs
month 15 114 lbs
month 16 117 lbs
month 17 120 lbs
month 18 122 lbs
month 19 124 lbs
month 20 126 lbs
month 21 128 lbs

Growth curve of Bullmastiff females:

Bullmastiff females weigh slightly less compared to males. At the age of 3 months the weight is about 31 - 31 lbs. After 6 months, the weight is between 62 - 70 lbs. On her first birthday, the Bullmastiff female weighs between 84 - 93 lbs and is another 10 months later, at the age of 1.8 years, with 99 - 119 lbs already fully grown.

month 2 17 lbs
month 3 31 lbs
month 4 45 lbs
month 5 58 lbs
month 6 70 lbs
month 7 75 lbs
month 8 79 lbs
month 9 83 lbs
month 10 86 lbs
month 11 90 lbs
month 12 93 lbs
month 13 97 lbs
month 14 99 lbs
month 15 102 lbs
month 16 104 lbs
month 17 107 lbs
month 18 109 lbs
month 19 110 lbs
month 20 112 lbs
month 21 115 lbs
month 22 117 lbs

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Questions and answers about the Bullmastiff

How much does a Bullmastiff puppy weigh?

A Bullmastiff puppy weighs between 17 - 18 lbs at the age of 8 weeks (2 months). At the age of 16 weeks (4 months), Bullmastiff puppies already weigh 43 - 50 lbs. So the puppies gain up to 32 lbs within only 2 months.

How big does a Bullmastiff become?

A Bullmastiff male will usually grow between 64 - 68 cm. Bullmastiff Females normally grow between 61 - 66 cm.

When is a Bullmastiff fully grown?

Bullmastiff males are full grown at about 22 months, Bullmastiff females at about 22 months.