Bullmastiff Growth Chart (Weight Chart & Size Chart)

Some things are allowed to catch you off guard when it comes to your dog. However, one of those things should not be your dog’s potential size. Before getting a dog, it’s safe to assume you already know whether you want a large or small breed. So, if you’ve decided to get a Bullmastiff, you should be aware of how big your dog can grow.

The Bullmastiff growth chart below will give you an idea of how fast your dog will grow from puppy to adulthood.

Bullmastiff Growth Chart
Bullmastiff Growth Chart

When Do Bullmastiffs Stop Growing?

Large dog breeds, such as the Bullmastiff, typically take longer to mature. Because no scientific studies have been conducted to determine the growth rate of these dogs, the only data available is based on the personal observations of individual dog owners and breeders.

Each dog is unique and matures at a different rate. Dog owners have discovered that these dogs stop growing between the ages of 18 and 20 months, with some dogs growing larger until they are a full two years old.

A Bullmastiff will continue to fill out and gain weight after its second birthday, but it will not grow any taller.

Bullmastiff Growth Pictures

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Bullmastiff puppy
Bullmastiff puppy
Bullmastiff puppy
Bullmastiff puppy
Bullmastiff puppy

What is the Standard Bullmastiff Size

Female Bullmastiffs are typically completely matured between the ages of 18 and 20 months. Male Bullmastiffs finish growing between 18 and 20 months, however many take 2 years, and some can take 3 to 4 years.

Bullmastiff Weight Chart

Here is the weight chart of a Bullmastiff:

AgeMale WeightFemale Weight
1 month9 – 12 lbs9 – 12 lbs
2 months19 – 28 lbs17 – 25 lbs
3 months37.5 – 43 lbs34.5 – 40 lbs
4 months48 – 55 lbs44 – 52 lbs
5 months58 – 66.3 lbs54 – 62.5 lbs
6 months69.5 – 77.3 lbs64 – 74 lbs
7 months74 – 85.5 lbs68 – 82 lbs
8 months82 – 93.5 lbs75 – 88 lbs
9 months89 – 98.5 lbs80.5 – 92 lbs
10 months92.3 – 105 lbs84 – 99 lbs
12 months102 – 118 lbs93 – 110 lbs
1.5 years105 – 121 lbs98 – 114 lbs
Fully grown110 – 130 lbs100 – 120 lbs
Bullmastiff Weight Chart

Bullmastiff Growth Chart – What To Expect
Bullmastiff Weight Chart by Age

Bullmastiff Weight  1-2 weeks

A newborn Bullmastiff puppy must be fed at least every two hours around the clock. With large litters and the high growth rates of this breed, there may not be enough milk from the mother for every youngster, and bottle feeding in addition to mother’s milk may be essential.

The mother will lick her dogs during this period to encourage them to eliminate. If she does not do this, the dog owner will have to assist a little, which is not a negative thing because it is part of a very early socialization process that is critical for this breed.

Bullmastiff Weight 3-12 weeks

The mother will regurgitate her kibble for her babies to eat at this time. This is a sign that you can begin feeding the puppies high-quality puppy chow that has been soaked in water. You can also put a bowl of water out for the puppies to sip from at this time.

When the puppies reach the age of 12 weeks, they are ready to eat adult food. The dogs should be fed twice a day to avoid bloating from eating too much at once.

Bullmastiff Weight 4-6 months

Males at 4 months of age can weigh 48 to 55 lbs (21.8 to 24.9 kg) and stand 20 to 22 inches tall (50.8 to 55.9 cm).

Females will weigh 44 to 52 lbs (20 to 23.5 kg) and stand between 19 and 21 inches (48.3 to 53.3 cm) tall.

Bullmastiff Weight  7-9 months

Males 9 months old can weigh 89 to 98.6 lbs (40.4 to 44.7 kg) and stand 22.5 to 24.5 inches tall (57.2 to 62.2 cm).

Females will weigh 80.4 to 92 pounds (36.5 to 41.7 kg) and stand 21.5 to 23.5 inches tall (54.6 to 59.7 cm).

Bullmastiff Weight  10-12 months

Your Bullmastiff will grow, but at a significantly slower rate. Your dog’s bones, muscles, and joints are still growing until 18 months, so don’t over-exercise him because it will harm his development and cause problems later in life.

Males at 12 months of age can weigh 102 to 118 lbs (46.3 to 53.5 kg) and stand 23.5 to 25.5 inches tall (59.7 to 64.8 cm).

Females will weigh between 93 and 110 pounds (42.2 to 49.9 kilograms) and stand between 22.5 and 24.5 inches (57.2 to 62.2 cm) tall.

Bullmastiff Adult Weight 

The average adult Bullmastiff stands between 24 and 27 inches tall and weighs between 100 and 130 pounds. Males are typically an inch taller and weigh approximately ten pounds more than females. However, keep in mind that Bullmastiff puppies start at 12 inches and 20 pounds and grow quickly.

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Information on Bullmastiff
Information on Bullmastiff

Bullmastiff Height Chart

Herer is the height chart of a Bullmastiff

AgeMale HeightFemale Height
2 months12 – 14 inches(30.5 – 35.6 cm)12 – 14 inches(30.5 – 35.6 cm)
3 months18.5 – 20 inches(47 – 50.8 cm)18.5 – 20 inches(47 – 50.8 cm)
4 months20 – 22 inches(50.8 – 55.9 cm)19 – 21 inches(48.3 – 53.3 cm)
5 months21 – 23 inches(53.3 – 58.4 cm)20 – 22 inches(50.8 – 55.9 cm)
6 months21.5 – 23.5 inches(54.6 – 59.7 cm)20.5 – 22.5 inches(52.1 – 57.2 cm)
7 months21.5 – 23.5 inches(54.6 – 59.7 cm)20.5 – 22.5 inches(52.1 – 57.2 cm)
8 months22 – 24 inches(55.9 – 61 cm)21 – 23 inches(53.3 – 58.4 cm)
9 months22.5 – 24.5 inches(57.2 – 62.2 cm)21.5 – 23.5 inches(54.6 – 59.7 cm)
10 months22.5 – 24.5 inches(57.2 – 62.2 cm)21.5 – 23.5 inches(54.6 – 59.7 cm)
11 months23 – 25 inches(58.4 – 63.5 cm)22 – 24 inches(55.9 – 61 cm)
12 months23.5 – 25.5 inches(59.7 – 64.8 cm)22.5 – 24.5 inches(57.2 – 62.2 cm)
18 months24 – 26 inches(61 – 66 cm)23 – 25 inches(58.4 – 63.5 cm)
Fully grown(20 – 24 months)25 – 27 inches(63.5 – 68.6 cm)24 – 26 inches(61 – 66 cm)
Bullmastiff Height Chart

How Do You Measure the Height of Your Bullmastiff?

Taking your Bullmastiff’s height will be more difficult than verifying its weight. You’ll need a little more expertise and information to achieve the proper height.

There are numerous reasons why you should know your Bullmastiff’s height and why the information must be accurate. You’ll need the correct height to purchase a proper doggy door, for its medical records, to purchase the necessary accessories, and so on.

To begin, you’ll need a carpenter’s level, a measuring tape, a pencil (as a marking instrument), and, finally, a door frame or wall.

The height of a dog is not measured from its paws to its head since that would be incorrect. The correct height is obtained by measuring from the paws to the withers.

Step 1: Stand your Bullmastiff up against a wall.

The first step in measuring your Bullmastiff’s height is to have it stand upright against a wall. You can’t force it to stand straight, so you’ll have to think of a creative approach to obtain it.

I’ve discovered that the easiest way to accomplish this is to enlist the assistance of another person who can help you hold the dog or lure it with a treat.

Step 2: Locate Its Withers

Bullmastiffs are not a particularly hairy breed, so locating their withers should be simple. The withers are the points where the shoulders meet the neck, and this is where the carpenter’s level should be placed.

Despite the Bullmastiff’s short hair, you should still use your hands to feel for the withers to ensure you’re looking in the appropriate place.

Step 3: Lay the Level Across the Bullmastiff’s Withers.

Place the carpenter’s level across your Bullmastiff’s withers, making sure the point hits the wall. Remember that the level must be straight for the measurement to be accurate, so keep your hands steady.

After that, you can use a marker or pencil to indicate where the level meets the wall. In this manner, you have transferred the height of your Bullmastiff to the wall.

Step 4: Take Your Measuring Tapes

The hard work has been completed at this point, and all that remains is to obtain a figure. Using a measuring tape, measure the distance from the ground to the mark on the wall. The measurement on the tape represents your Bullmastiff’s height.

How To Weigh Your Bullmastiff Puppy?

Do you want to know how to weigh your Bullmastiff at home? Weighing your puppy will allow you to keep track of their weight and ensure that they are at an appropriate weight for their age.

A bathroom scale is required to weigh your Bullmastiff at home. To begin, walk onto the scale and weigh yourself. Then, with your puppy in tow, walk on the scale.

Finally, deduct your weight from the combined weight of you and your Bull Terrier. This is the weight of your puppy.

If your Bullmastiff can sit still on the scale, you can also purchase a dog scale.

What Is A Bullmastiff’s Neck Size?

To determine the neck size of your dog, use a soft and flexible tape measure to determine the neck size of your dog where her collar naturally falls. Then, put two fingers between your dog’s neck and the tape measure to ensure that the dog collar fits snugly but comfortably. Basenji’s average neck circumference is between 12 and 18 inches.

How Big Do Bullmastiffs Get?

How big do they get?
How big do they get?

When bullmastiffs reach physical maturity, they can grow to be quite large. Studies only show average growth statistics for all Bullmastiffs, but yours could be different.

That is, your Bullmastiff may weigh more than the weight listed here, and he or she may also grow taller. Similarly, it could be smaller than the average.

Male Bullmastiffs can reach a height of 25 – 27 inches (63.5 – 78.6 cm) and weigh 110 – 130 pounds (50 – 59 kg) when fully grown. A female Bullmastiff weighs between 100 and 120 pounds (45.4 and 54.4 kg) and stands between 24 and 26 inches (61 and 66.04 cm) tall.

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Expect your Bullmastiff to continue growing until it is at least two years old.

If your dog’s genes allow it, it will grow to these sizes. And that isn’t all. You, as the owner, have a role to play as well. If you provided your Bullmastiff with the nutrients it required to grow, it would have reached full maturity.

Factors That Affect Bullmastiff Puppy Growth 


Another factor that influences a Bullmastiff’s size is the genes it carries. Looking at a Bullmastiff’s birth parents can provide insight into its future. As a result, smaller Bullmastiff parents are more likely to have smaller Bullmastiff puppies. This is why it is recommended that you look at a puppy’s parents before purchasing it. Studying Bullmastiff’s parents will teach you a lot.

Male Bullmastiffs are generally larger than females. So, if you get a female, don’t expect her to grow faster than a male (even though it could happen). Males will be approximately 10 pounds (4.5 kg) heavier and approximately one inch (2.5 cm) taller.

Diet & Nutrition

The type of food your Bullmastiff eats will determine how well he grows. Bullmastiff puppies feed on their mothers’ breasts from birth, which contains all of the nutrients they require to grow. When they stop breastfeeding, you must make certain that they continue to receive these nutrients. A well-balanced diet will ensure that your Bullmastiff grows steadily until maturity.

Running Bullmastiff
Running Bullmastiff

Physical Activity & Health

A Bullmastiff’s size is determined by the amount of physical activity it engages in. If it consumes all of the necessary nutrients but does not engage in adequate exercise, it will undoubtedly become very large. As a result, Bullmastiffs require the appropriate amount of exercise to maintain a healthy size.

A healthy Bullmastiff will develop normally. Diseases such as hypothyroidism can cause a Bullmastiff to gain excessive weight, while cancer can cause it to lose excessive weight. Endoparasites are also a significant cause of undergrowth in dogs. As a result, a Bullmastiff will grow as long as it is in good health.

Will My Bullmastiff Grow After He’s Been Neutered/Spayed?

There are several misconceptions about how neutering or spaying dogs before puberty might result in reduced growth. In truth, carrying out these treatments causes a gain in height, which can lead to a slew of difficulties in the future. Of course, there are numerous benefits to spaying/neutering Bullmastiffs at a young age, but the hazards are far greater.

Wait until after your female Bullmastiff’s first heat cycle to spay her. Males should not be neutered until they are well over their second year. The explanation for this is straightforward: Bullmastiffs are not like lesser breeds that mature in 9 to 18 months.

They continue to develop well into their second year (sometimes up to their third year). The testes and ovaries create hormones that determine the growth and structure of the bones as they mature.

Because Bullmastiffs are still growing in their second year, neutering/spaying them too soon will cause complications. Early “fixing” will cause a delay in the closing of the growth plates, causing the dog to grow larger and may cause health problems in the long term.

Common Questions about Bullmastiff

At What Age Is A Bullmastiff Fully Grown?

Large dog breeds typically reach the end of their growth cycle later than smaller dog breeds. When Bullmastiffs stop developing is a source of contention. There hasn’t been any scientific investigation on the subject, therefore it’s primarily based on assumptions and personal experiences.

Each Bullmastiff is unique, and they may reach physical maturity at different ages. A Bullmastiff will typically cease developing between the ages of 18 and 20 months.

It will last till their second birthday for some. At this point, the Bullmastiff will stop growing in height but will gain a few pounds until its third birthday.

Main Types and Breeds Of Bullmastiffs

Pit Bull Mastiff

The Pit Bullmastiff, a cross between the Bullmastiff and the American Pitbull Terrier, is first on my list. The Pitbull and Bullmastiff are both fairly enormous, thus their combination is also quite large.

Males can weigh 120–150 pounds (54.4–68 kg) and stand 27–29 inches (68.7–73.7 cm) tall. Females, on the other hand, can weigh 100 – 130 pounds (45.4 – 59 kg) and stand 25 – 27 inches (63.5 – 68.6 cm) tall.


The Clumberstiff is a cross between a Bullmastiff and a Clumberstiff Spaniel. This is a wonderful match, and the Clumberstiff got more of the Bullmastiff’s size.

Male Clumberstiffs can weigh 90 – 110 pounds (40.8 – 49.9 kg) and stand 22 – 24 inches (55.9 – 61 cm) tall. Females are slightly smaller, weighing 80–100 pounds (36.3–44.4 kg) and standing 21–23 inches (53.3–58.4 cm).

Bull Daniff

The Bull Daniff is created by crossing a Bullmastiff and a Great Dane. Because both parents are huge, this is a particularly massive breed.

Male Bull Daniffs can reach weights of 160 – 200 pounds (72.6 – 90.7 kg) and heights of 33 – 34 inches (83.8 – 86.4 cm). Females are not far behind, weighing between 115 – 150 pounds (52 – 2 – 68 kg) and standing 32 – 33 inches (81.3 – 83.8 cm).

Retriever of the Golden Bullmastiff

The genes of the Golden Retriever somewhat lower the bulk and soften the appearance of the Bullmastiff. The Golden Bullmastiff Retriever is a cross between these two breeds. The size difference between males and females is not great, yet it exists.

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Males can weigh 95–110 pounds (43.1–49.9 kg) and stand 25–27 inches (63.5–68.6 cm). Females, on the other hand, weigh between 85 and 100 pounds (38.6 to 45.4 kg) and can grow to reach as tall as 23 to 25 inches (58.4 to 63.5 cm).


The Doubull-Mastiff is a cross between an English Mastiff and a Bullmastiff. The Doubull-Mastiff is a behemoth in comparison to its parents.

There are no size variations between male and female Doubull-Mastiffs, according to the size charts. Males and females weigh between 130 and 200 pounds (59.90.7 kg) and stand between 27 and 36 inches (68.6 and 91.4 cm) tall.

Bullmastiff Staffy Bull

The Staffy Bull Bullmastiff is one of those dog breeds that can be either large or small. Staffy Bull Bullmastiffs are the offspring of Bullmastiffs and Staffordshire Bull Terriers. Your dog’s size will surprise you with this breed because you will either receive a huge or a medium dog.

Males weigh 38 – 130 pounds (17.2 – 59 kg) and stand 14 – 27 inches (35.6 – 68.5 cm), whereas females weigh 34 – 120 pounds (15.4 – 54.4 kg) and stand 14 – 26 inches (35.6 – 66 cm).

How Long Are Bullmastiffs Pregnant?

When a female dog becomes pregnant, the dog gestation period begins and lasts until she gives birth to her litter. The gestation period is usually nine weeks or 63 days long, although it can be as little as 58 days or as long as 68 days.

You may not notice any obvious evidence that your dog is pregnant, but you may notice other symptoms such as periodic vomiting, changes in appetite, swelling nipples, and somewhat pale gums.

How Many Puppies Do Bullmastiffs Have?

Bullmastiffs have huge litters all the time. Typical litter size is eight puppies. Mastiff bitches frequently have difficulty giving birth, and C-sections are frequently performed to assist them.

With this breed, a puppy may become trapped in the birth canal, resulting in the death of both the puppy and the mother, as well as any unborn offspring.

What Is The Life Expectancy Of Bullmastiffs?

Mastiffs live for only 8 to 10 years since they age faster than smaller canines. Furthermore, the breed’s high cancer incidence adds to a relatively low life expectancy.

How Much Does It Cost To Own A Bullmastiff?

A Bullmastiff puppy will most likely cost you between $1,000 and $2,200, with $1,500 being the average price. The first year’s expenses should be roughly $5,000, and subsequent years should be around $2,040 per year or $170 per month.

Is your Bullmastiff obese or underweight?

Is this Britain's fattest dog? Mizzy the 11.4 STONE bullmastiff, whose  collar fits around her vet's waist, checks into animal fit club | Daily  Mail Online

It is simple to determine whether your Bullmastiff is overweight or underweight. If you keep a consistent record of your Bullmastiff’s weight, you will be able to tell when it has strayed into an unhealthy zone. However, body mass index is not necessarily the best indicator of whether your dog has grown overweight or underweight.

By carefully examining your Bullmastiff, you may determine whether it is overweight or underweight. All of the telltale symptoms can be found on its ribs, waist, shoulders, and even hips. If you notice your dog has too much-exposed bone, he is underweight.

However, the eyes alone cannot do justice. To feel your Bullmastiff’s body, you’ll need to use your hands. If you can’t feel the bones in those joints, your dog is probably overweight.

How To Help Your Bullmastiff Lose Weight If He Is Overweight 

As with humans, exercise is critical for your overweight dog’s health. Increased movement helps your dog burn off excess energy (and calories consumed). Avoid panic! Exercising your pet does not have to include marathons or lengthy hikes. Regular walks and the opportunity to run and play safely off-leash. Even creating a stimulating indoor environment that encourages your dog to exercise on a regular basis can help. Bear in mind that different breeds require varying amounts of exercise, so visit your veterinarian, breeder, or your dog’s breed standard for recommendations on recommended activity levels.

Distinguish Begging from Hunger

Begging is not necessarily motivated by a desire for more food; it is also used to gain attention. (And, by rewarding the behavior, you reinforce and encourage it to continue.) If your dog begs, do not automatically assume he is hungry. Trust your instincts and keep track of the date and time of your last meal. If your dog is prone to begging and you are prone to succumb to those puppy dog eyes, choose a high-protein meal with a fiber blend to help control your dog’s hunger and voluntary food consumption. In this manner, you may feed your dog with the assurance that he will feel fuller and content for a longer period of time.

Restriction on treats and table scraps

Even when our dogs are not begging, many of us provide an excessive amount of treats and table scraps. Dogs are not required to share our food! Consider treats and scraps for your pet in the same way that you would candy for children to help you keep them in check. If you’re going to utilize snacks for training, choose low-calorie, low-fat ones and keep the portions small.

As an alternative, keep in mind that clickers are excellent for reinforcement… and they have no calories! After all, a few extra pounds can make a significant impact in the lives of dogs, which are significantly smaller than humans. (Even the colossal breeds!) Therefore, focus on a balanced diet and resist the temptation to “reward” them with extra.

Customize Your Dog’s Diet

Not all weight-loss foods are created equal, which is why it’s critical to match your dog’s nutrition plan to their unique needs. Choose a brand that caters to your dog’s unique needs, whether they be weight control, dietary sensitivities, or illnesses.

Conclusion on Bullmastiff Growth Chart

Within the family, Bullmastiffs have a gentle disposition, but they are quite protective and are not excessively friendly with strangers or other dogs.

Despite their size and fearsome appearance, they are safe to be around toddlers and children. Mastiffs prefer to live inside and enjoy lounging on furniture.

They take a long time to grow – up to three years – so you may have a large and heavy dog insistent on being cuddled on your lap for the first three years.

Frequently Asked Questions:

What is the growth rate of a bullmastiff?

Bullmastiffs are slow growers and should stay that way. They should grow slowly, with a female not reaching full physical maturity until she is 18 or 20 months old, and a male not reaching full size and weight until he is 3 to 3,5, and sometimes 4 years old!

How strong is a Bullmastiff’s bite?

Some people like to put numbers to things, and most sources seem to agree that a Mastiff’s bite strength ranges from 552 to 556. In comparison, a human bite force averages 120 pounds.

Are Bullmastiffs intelligent?

Aside from drooling and snoring, Bullmastiffs are intelligent, loyal, and protective dogs who love to please. They are active, self-assured, alert but affectionate, and they tolerate children well. They don’t bark much and can live in apartments if they get daily exercise.

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