How big do Bullmastiffs get? (+weight chart)

how big do Bullmastiffs get

Bullmastiffs are renowned for their impressive size and gentle demeanor, representing a perfect blend of strength and companionship. Originating as a breed in the 19th century for estate guarding, they have evolved into affectionate family pets. Understanding their growth patterns and final size is essential for prospective owners, as these large canines require adequate space and exercise to maintain their health and happiness. This introduction sets the stage to explore how big Bullmastiffs do get, the factors influencing their growth, and the importance of proper care for these sizable, yet tender, companions.

Bullmastiffs are a large breed, with adult males typically weighing between 110 to 130 pounds (50 to 59 kg) and standing about 25 to 27 inches (64 to 69 cm) tall at the shoulder. Females are slightly smaller, usually weighing around 100 to 120 pounds (45 to 54 kg) and standing 24 to 26 inches (61 to 66 cm) tall. Their robust build and significant size make them imposing, yet they are known for their gentle and affectionate nature.

How big do bullmastiffs get?

Bullmastiffs, with their strong and imposing presence, are undeniably big dogs. But just how big do they get? Well, let’s dive into the world of these majestic creatures.

When it comes to their size, bullmastiffs are considered large breed dogs. On average, male bullmastiffs stand between 25 to 27 inches at the shoulder and weigh around 110 to 130 pounds. Although they are so huge, Bullmastiffs can be good family dogs.

Females tend to be slightly smaller, measuring around 24 to 26 inches in height and weighing between 100 to 120 pounds. However, it’s important to note that these figures are averages and individual variations can occur within the breed.

To better understand the growth patterns of bullmastiffs, we need to explore when they reach their full size. Like many large breeds, bullmastiffs experience a relatively slow growth rate compared to smaller dogs.

It takes them approximately two years before they reach their full physical maturity. During this time, they will go through distinct stages of development that gradually shape their impressive stature.

Now, let’s take a closer look at a bullmastiff weight chart for both males and females as they progress from puppyhood to adulthood. At around three months old, male bullmastiff puppies typically weigh between 30-40 pounds while female puppies weigh slightly less at approximately 25-35 pounds.

By six months of age, male bullmastiffs generally weigh between 70-80 pounds with females weighing around 60-70 pounds. As they approach one year old, male bullmastiffs usually tip the scales at about 90-100 pounds, while females usually weigh in at around 80-90 pounds.

By this point in their lives, these furry giants have already started showcasing some of their adult characteristics but still have a bit more growing left to do. Reaching the age of two years marks when most Bullmastiffs have attained their full-grown size and weight.

Males tend to weigh between 110-130 pounds, while females typically range from 100-120 pounds. It’s worth mentioning that individual genetics, diet, exercise levels, and overall health can all influence a Bullmastiff’s size and weight within these general guidelines.

Bullmastiffs are undeniably big dogs; their stature commands attention wherever they go. With males reaching heights of 25 to 27 inches and weighing between 110 to 130 pounds, and females slightly smaller at around 24 to 26 inches in height and weighing between 100 to 120 pounds, these gentle giants are hard to miss.

Their slow growth rate over the course of two years ensures a gradual development into their fully grown size. Whether you’re an admirer of large dogs or considering adding a Bullmastiff to your family, their impressive size is just one aspect that makes them truly remarkable companions.

When are Bullmastiffs fully grown?

When it comes to Bullmastiffs, one common question often arises is when they are fully grown. Well, my fellow canine enthusiasts, fret not! I am here to shed some light on this intriguing topic.

Bullmastiffs typically reach their full size between the ages of 18 months and 2 years. However, it’s important to note that while their height may stop increasing around this time frame, they may continue to fill out in terms of muscle mass and body weight for a little longer.

So don’t be surprised if your Bullmastiff keeps growing in all the right places even after reaching the ripe old age of two! Now, let’s delve into some specifics about the bullmastiff size when they are fully grown.

On average, male Bullmastiffs can measure anywhere between 25 to 27 inches at the shoulder and weigh a whopping 110 to 130 pounds! Yes, you read that right—these gentle giants truly live up to their name!

As for the fairer sex of this magnificent breed, female Bullmastiffs tend to be slightly smaller but still command attention, with heights ranging from 24 to 26 inches and weights ranging from 100 to 120 pounds. It’s essential to consider not only bullmastiff weight but also factors such as genetics and individual growth patterns when determining when your furry friend has reached full maturity.

Some Bullmastiffs might achieve their final form on the earlier end of the spectrum at around eighteen months old, while others might take a bit longer until they hit that two-year mark. So there you have it—now you know when these majestic canines typically reach their peak size.

It’s fascinating how these dogs transform from adorable little puppies into powerful adults over time. Whether your Bullmastiff is already fully grown or still has some growing left to do, cherish every moment with them because they’ll forever be a loyal companion by your side!

Weight Chart Bullmastiff male and female

When it comes to the size and weight of Bullmastiffs, there can be some variation between males and females. Generally, male Bullmastiffs tend to be larger and heavier than their female counterparts. Male Bullmastiffs can reach a height of 25 to 27 inches (63 to 68 cm) at the shoulder, while females are slightly smaller, standing at around 24 to 26 inches (61 to 66 cm).

In terms of weight, male Bullmastiffs can weigh anywhere between 110 to 130 pounds (50 to 59 kg), while female Bullmastiffs usually range from 100 to 120 pounds (45 to 54 kg). It’s important to note that these figures are just averages, and individual Bullmastiffs may fall outside of these ranges.

Factors such as genetics, diet, exercise levels, and overall health can contribute to variations in size and weight among individuals within the breed. The growth rate of a Bullmastiff is quite remarkable.

From birth until about four months old, they tend to grow rapidly in both height and weight. By six months old, they are usually close to their adult height but may continue filling out until they reach about two years of age.

During this time, it is crucial for owners to provide them with proper nutrition and regular vet check-ups. Monitoring a bullmastiff’s weight is vital throughout its life.

Puppies should be weighed regularly during their initial stages of development to ensure they are growing at a healthy rate. As adults, maintaining an ideal weight is crucial for their overall well-being.

Obesity can lead not only to joint problems but also various health issues such as heart disease or diabetes. Understanding the typical weight range for both male and female bullmastiffs helps owners keep track of their dog’s growth progress during different life stages.

Regular visits with a veterinarian will help ensure that the dog is within a healthy weight range based on its size, age, and overall health. The weight chart for Bullmastiffs indicates that males are generally larger and heavier than females.

However, individual variations should be expected within the breed. Proper nutrition, exercise, and regular veterinary check-ups are vital to ensure a Bullmastiff grows into a healthy adult with an appropriate weight range.

Age (Months)Male Weight (lbs/kg)Female Weight (lbs/kg)
18 – 12 lbs (3.6 – 5.4 kg)7 – 10 lbs (3.2 – 4.5 kg)
220 – 30 lbs (9.1 – 13.6 kg)18 – 27 lbs (8.2 – 12.2 kg)
335 – 45 lbs (15.9 – 20.4 kg)30 – 40 lbs (13.6 – 18.1 kg)
445 – 55 lbs (20.4 – 24.9 kg)40 – 50 lbs (18.1 – 22.7 kg)
555 – 65 lbs (24.9 – 29.5 kg)50 – 60 lbs (22.7 – 27.2 kg)
665 – 75 lbs (29.5 – 34.0 kg)55 – 65 lbs (24.9 – 29.5 kg)
775 – 85 lbs (34.0 – 38.6 kg)60 – 70 lbs (27.2 – 31.8 kg)
885 – 95 lbs (38.6 – 43.1 kg)65 – 75 lbs (29.5 – 34.0 kg)
995 – 105 lbs (43.1 – 47.6 kg)70 – 80 lbs (31.8 – 36.3 kg)
10100 – 110 lbs (45.4 – 49.9 kg)75 – 85 lbs (34.0 – 38.6 kg)
11105 – 115 lbs (47.6 – 52.2 kg)80 – 90 lbs (36.3 – 40.8 kg)
12110 – 120 lbs (49.9 – 54.4 kg)85 – 95 lbs (38.6 – 43.1 kg)
13115 – 125 lbs (52.2 – 56.7 kg)90 – 100 lbs (40.8 – 45.4 kg)
14120 – 130 lbs (54.4 – 59.0 kg)95 – 105 lbs (43.1 – 47.6 kg)
15125 – 135 lbs (56.7 – 61.2 kg)100 – 110 lbs (45.4 – 49.9 kg)
16130 – 140 lbs (59.0 – 63.5 kg)105 – 115 lbs (47.6 – 52.2 kg)
17135 – 145 lbs (61.2 – 65.8 kg)110 – 120 lbs (49.9 – 54.4 kg)
18140 – 150 lbs (63.5 – 68.0 kg)115 – 125 lbs (52.2 – 56.7 kg)

This chart provides an approximate range for the weights of Bullmastiffs in both pounds and kilograms for each age milestone. Remember, individual dogs may vary in weight, and it’s important to monitor their health with regular veterinary check-ups.


It is evident from the information discussed that Bullmastiffs are an impressive breed in terms of size and weight. As we have seen from the bullmastiff weight chart, males typically weigh between 110 to 130 pounds (50 to 59 kilograms), while females weigh slightly less at around 100 to 120 pounds (45 to 54 kilograms).

@ (Beitragsbild)


I am Marco and I have the pleasure of living with 3 large Mastiff-type dog breeds. I would like to share my dog-related experiences on this blog

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