Updated on
Quick Links: Table of Contents
- Bullmastiff Growth
- Bullmastiff Weight and Growth Chart
- When do Bullmastiffs Stop Growing and How Big Do They Get?
- Bullmastiff Growth Calculator
- How Much Should a Bullmastiff Weigh?
- What is the Height of the Bullmastiff?
- Is Your Bullmastiff Growing Normally? This is How to Tell
- How to Measure the Weight of your Bullmastiff
- How Fast Do Bullmastiffs Grow? Bullmastiff Growth Rate
- Size of Male Bullmastiff Versus Size of Female Bullmastiff
- Male Bullmastiff Weight and Growth Chart
- Female Bullmastiff Weight and Growth Chart
- Bullmastiff Growth Stages
- Male Bullmastiff Weight/Growth Chart in KG
- Female Bullmastiff Weight/Growth Chart in KG
- How Much Should a 12-Week-old Bullmastiff Weigh?
- How Much Should a 4-Month-old Bullmastiff Weigh?
- How Much Should a 6-Month-old Bullmastiff Weigh?
- How Much Should a 1-Year-old Bullmastiff Weigh?
- How to Tell If Your Bullmastiff is Overweight
- Conclusion on Bullmastiff Weight and Growth
Bullmastiff Growth
Did you just get the Bullmastiff puppy? And do you want to know when your Bullmastiff will stop growing and how big your Bullmastiff will get? Or do you want to know if your Bullmastiff is of the ideal weight for its age?
In this article, we will answer all these relevant questions related to Bullmastiff growth and weight.
If you do not own the Bullmastiff yet, make sure you purchase your Bullmastiff from an reputable Bullmastiff breeder. Also, check out our Bullmastiff buying guide and Bullmastiff price guide here.
You can also work with a reputable rescue to adopt a puppy.
It is important for you as a caring Bullmastiff owner to know if your Bullmastiff is growing normally and that your Bullmastiff is not overweight or underweight.
Extensive research studies have shown that most dogs are overweight because their owners spoil them with food, treats, and easy life styles. Most dogs eat way too much and do not get enough exercise. Research has also shown that one of the reasons many dogs die young is because they are overweight. However, you can extend your dog`s life by making sure your dog is of healthy weight and growth.One final reason to keep track of your Bullmastiff`s weight and growth is that your Bullmastiff`s weight and growth pattern can tell you if your Bullmastiff has some underlying health conditions (such as bone, heart, hormone diseases). This is what recent research has shown.
This article contains the Bullmastiff growth calculator that you can use to predict your Bullmastiff`s adult weight. This article also contains the Bullmastiff growth chart and weight calculator that you can use to approximately tell if your Bullmastiff`s weight is in the normal range.
However, the more accurate method to predict and track normal growth in your Bullmastiff is by regularly weighing your Bullmastiff and recording the weight of your Bullmastiff with our free dog weight tracker and weight predictor. Our tool will tell you, first, a more accurate future weight of your Bullmastiff and, second, if your Bullmastiff is growing normally.
We designed our dog weight tracker and weight predictor based on a recent research study carried out by researchers from Banfield Pet Hospitals and the University of Liverpool. This study collected and analyzed the weight of over 6 million healthy dogs in the United States. The dogs studied included dogs in the Bullmastiff weight category.
Also, check out our Bullmastiff food calculator here to know how much food to feed your Bullmastiff based on your Bullmastiff`s weight and age.
Bullmastiff Weight and Growth Chart
Below is the typical growth chart and weight chart of Bullmastiffs at different stages in their lives.
Note that your Bullmastiff may be slightly heavier or lighter than what the chart says. The weight chart is an average weight chart.
Also, this growth chart is the combined growth chart of the male and female Bullmastiff.
To know how much food to feed your Bullmastiff at different ages and weights, check out our Bullmastiff feeding guide and calculator.
To know how much water your Bullmastiff needs to drink at different ages and weights, check out our Bullmastiff water drinking guide and calculator.
Note that the growth pattern of a female Bullmastiff can be slightly different from the growth pattern of a male Bullmastiff
. Therefore, later on in this article, we will provide you with the gender-specific growth chart for the male and for the female Bullmastiff.| Age | Average Weight | Typical Weight Range |
|---|---|---|
| 15 Weeks | 47 LBS | 42 LBS – 52 LBS |
| 20 Weeks | 61 LBS | 55 LBS – 67 LBS |
| 25 Weeks | 73 LBS | 66 LBS – 80 LBS |
| 30 Weeks | 83 LBS | 74 LBS – 91 LBS |
| 35 Weeks | 91 LBS | 81 LBS – 101 LBS |
| 40 Weeks | 98 LBS | 86 LBS – 109 LBS |
| 45 Weeks | 103 LBS | 90 LBS – 115 LBS |
| 60 Weeks | 111 LBS | 97 LBS – 126 LBS |
When do Bullmastiffs Stop Growing and How Big Do They Get?
Your Bullmastiff will grow very fast in its first 54 weeks. At 54 weeks, your Bullmastiff will have reached 95 percent of its adult weight. Then your Bullmastiff will slowly stop adding more weight. At around 73 weeks (~17 months), your Bullmastiff should be at its maximum weight. Bullmastiffs stop growing at 73 weeks (~17 months).
The above discussion is general, and it applies to both male and female Bullmastiffs. However, male dogs usually grow at a different rate compared to female dogs
A male Bullmastiff will grow very fast in its first 55 weeks. At 55 weeks, a male Bullmastiff will have reached 95 percent of its adult weight at 55 weeks. A male Bullmastiff will then slowly stop adding more weight. At around 74 weeks (~17 months), a male Bullmastiff should have reached its maximum weight. Male Bullmastiffs stop growing at 74 weeks (~17 months).
Similarly, a female Bullmastiff will grow very fast in its first 53 weeks. At 53 weeks, a female Bullmastiff will have reached 95 percent of its adult weight at 53 weeks. A female Bullmastiff will then slowly stop adding more weight. At around 73 weeks (~17 months), a female Bullmastiff should have reached its maximum weight. Female Bullmastiffs stop growing at 73 weeks (~17 months).
See the growth graph of a Bullmastiff below.
As you can see in the Bullmastiff growth curve below, the Bullmastiff grows really fast in its early weeks, and then its growth levels off till it reaches 100 percent of the adult weight.
Bullmastiff Growth Calculator
Use the calculator below to estimate how big your Bullmastiff will get based on its current weight.
This Bullmastiff growth calculator is based on the typical weight curve of a Bullmastiff shown above. The calculator assumes that your Bullmastiff is growing normally, and not on its way to become overweight or underweight.
How Much Should a Bullmastiff Weigh?
Adult Bullmastiffs typically weigh between 100 to 130 pounds.
Above is a graph that shows how much a Bullmastiff should weigh at different ages. Check where the weight of your Bullmastiff falls in the graph for its age.
It is totally fine if the weight of your Bullmastiff falls in either the dark green or light green region of the graph. However, weight in the dark green region is more typical for Bullmastiffs.
If the weight of your Bullmastiff falls outside both the dark and light green region for its age, then you should consult a vet.
Also, you can use the Bullmastiff weight calculator below to find the typical weight and the normal weight range of Bullmastiffs, male or female, of any age between 12 weeks and 100 weeks.
If you want to see how the weight of your Bullmastiff compares to that of other Bullmastiff`s of its age, enter the weight of your Bullmastiff in the calculator, and the calculator will show you where your Bullmastiff stands on the weight chart.
The calculator will also tell you if your Bullmastiff is within the normal weight range for the Bullmastiff.
This Bullmastiff weight calculator uses information from belpatt.fr and data from a research study on dog weight carried out by researchers at the University of Liverpool.
Please, talk to your vet before taking any decision on your pet`s weight and health.
What is the Height of the Bullmastiff?
The adult Bullmastiff is 24 to 27 inches at the shoulder. This is the average adult height of the Bullmastiff.
Is Your Bullmastiff Growing Normally? This is How to Tell
Puppy growth predictors, growth charts, and growth calculators like the ones above are approximate methods for predicting growth in dogs. However, these tools have limited capabilities. This is because each dog is unique and a dog`s growth may be different from that of the overall dog population.
A more accurate and scientific way to predict a dog`s growth is to measure the dog`s weight every week and record the weight. Doing this with your Bullmastiff will give you a clearer picture of how your Bullmastiff is growing.
You can use our free tool to track your Bullmastiff`s growth and weight over time. Our tool will also let you know if your Bullmastiff is growing normally.
Tracking your Bullmastiff`s weight will let you see the unique growth trajectory of your Bullmastiff. You can use this growth trajectory to accurately predict how big your Bullmastiff will get. The growth trajectory will also let you know very early if your Bullmastiff will become overweight or underweight.
Monitoring your dog`s weight is important because pet obesity is one of the leading causes of premature death in dogs. And these days, pets gain weight very easily because their owners spoil them with lots of treats and food. Catching early abnormal weight in your dog and correcting it (through diet changes, exercise) can significantly extend your dog`s life.
Below is what a normal growth pattern and what abnormal growth patterns look like in Bullmastiffs. You can compare your Bullmastiff growth trajectory against these references to see if your Bullmastiff is growing normally or you can use our automatic tool.
How to Measure the Weight of your Bullmastiff
There are two methods you can use to measure your Bullmastiff`s weight.
The first method, which is the better and more accurate method to weigh your Bullmastiff, is to use a dog weighing scale.
Using a dog scale is important if you would like to monitor your Bullmastiff`s growth regularly to catch any abnormal growth early.
Having a scale for weighing your Bullmastiff will make it easy for you to weigh your Bullmastiff regularly without any trouble.
The scale that we recommend for weighing the Bullmastiff is this high durability and affordable W.C Redmon Precision Digital Pet Scale. Click here to check out this scale on Amazon.
The second method is to use a bathroom scale to weigh yourself while holding your Bullmastiff. Then use the same scale to weigh yourself without your Bullmastiff. Then calculate your weight when holding your dog minus your weight when not holding your Bullmastiff. This method is illustrated in the picture below.
However, note that this method of holding your dog on a scale is not very accurate, and it may be difficult for you to use this method to weigh your Bullmastiff if your Bullmastiff is very heavy or if your Bullmastiff is the type that would not stay still while being held.
How Fast Do Bullmastiffs Grow? Bullmastiff Growth Rate
Starting from 3 months of age, Bullmastiffs grow at a rate of 3.10 pounds per week (1.41 Kilograms per week) on average. Starting at 4 months, your Bullmastiff will gain 2.76 pounds (1.25 Kilograms) every week on average.
At 5 months of age, your Bullmastiff will grow at a rate of 2.42 pounds per week (1.10 Kilograms per week) on average. Then at 6 months, your Bullmastiff will gain 2.11 pounds (0.96 Kilograms) every week on average.
See the growth rate chart of the Bullmastiff below
| Age (Months) | Growth per week (Pounds) | Growth per week (Kg) |
|---|---|---|
| 3 Months | 3.10 | 1.41 |
| 4 Months | 2.76 | 1.25 |
| 5 Months | 2.42 | 1.10 |
| 6 Months | 2.11 | 0.96 |
| 7 Months | 1.81 | 0.82 |
| 8 Months | 1.53 | 0.70 |
Size of Male Bullmastiff Versus Size of Female Bullmastiff
The average size of a male Bullmastiff is 121 pounds (55 kg) while the average size of a female Bullmastiff is 110 pounds (50 kg).
In general, male dogs are usually bigger than female dogs.
Male Bullmastiff Weight and Growth Chart
The growth pattern of Male dogs is also different from that of Female dogs.
Adult male dogs are generally bigger in size than adult female dogs.
Below is the typical growth and weight chart of a Male Bullmastiff.
| Age | Average Weight | Typical Weight Range |
|---|---|---|
| 15 Weeks | 49 LBS | 46 LBS – 52 LBS |
| 20 Weeks | 64 LBS | 60 LBS – 67 LBS |
| 25 Weeks | 76 LBS | 72 LBS – 80 LBS |
| 30 Weeks | 86 LBS | 82 LBS – 91 LBS |
| 35 Weeks | 95 LBS | 89 LBS – 101 LBS |
| 40 Weeks | 102 LBS | 96 LBS – 109 LBS |
| 45 Weeks | 108 LBS | 100 LBS – 115 LBS |
| 60 Weeks | 117 LBS | 108 LBS – 126 LBS |
Female Bullmastiff Weight and Growth Chart
The growth pattern of female dogs is different from that of male dogs. On average, female dogs grow faster than males and reach full size earlier. For this reason, it`s important that the standard height and weight charts for dogs are gender-specific.
Also, adult female dogs are generally smaller in size than adult male dogs.
Below is the typical growth and weight chart of a Female Bullmastiff.
| Age | Average Weight | Typical Weight Range |
|---|---|---|
| 15 Weeks | 46 LBS | 42 LBS – 49 LBS |
| 20 Weeks | 59 LBS | 55 LBS – 63 LBS |
| 25 Weeks | 71 LBS | 66 LBS – 76 LBS |
| 30 Weeks | 80 LBS | 74 LBS – 86 LBS |
| 35 Weeks | 88 LBS | 81 LBS – 95 LBS |
| 40 Weeks | 94 LBS | 86 LBS – 101 LBS |
| 45 Weeks | 99 LBS | 90 LBS – 107 LBS |
| 60 Weeks | 106 LBS | 97 LBS – 115 LBS |
Bullmastiff Growth Stages
Your Bullmastiff will go through a number of developmental stages on its journey to adulthood. Your Bullmastiff`s growth pattern can be categorized into 6 distinct stages: Neonatal, Transitional, Socialization Period, Juvenile Period, Adolescent Period, and Maturity.
You can know the developmental stage of your Bullmastiff based on how old your Bullmastiff is.
1. Bullmastiff Neonatal Period
Bullmastiff Neonatal Period is from Birth to 2 weeks. During this stage, the Bullmastiff puppy will be totally dependent on its mother. The Bullmastiff puppy`s eyes will still be unopened with no sense of vision. The Bullmastiff puppy will only have the senses of taste and touch
2. Bullmastiff Transitional Period
Bullmastiff Transitional Period is from 2 weeks to 3 weeks. During this stage, the Bullmastiff puppy will continue to develop a better sense of hearing and taste. The puppy`s teeth will start coming through and its eyes will begin to open.
During this stage, the Bullmastiff puppy begins to crawl forward and backward, begins to stand, begins to wag its tail. This is also the age where your puppy’s personality begins to develop.
3. Bullmastiff Socialization Period
Bullmastiff Socialization Period is from 3 weeks to 14 weeks. During this stage, the Bullmastiff puppy will be able to fully use all of its senses (vision, smell, touch, hearing, taste), and the puppy will learn to survive without its mother.
Also during this stage, the Bullmastiff puppy learns how to act like a dog (biting, chasing, barking, etc). The rapid learning and socialization of the puppy occur at this stage, and what the Bullmastiff puppy learns in this stage will have a long-term effect on the puppy`s behavior as an adult.
4. Bullmastiff Juvenile Period
Bullmastiff Juvenile Period is from 3-4 Months to 5-14 months. During this stage, the Bullmastiff puppies will attempt to clarify and resolve their boundaries. Their baby teeth start getting replaced by adult teeth.
5. Bullmastiff Adolescent Period
Bullmastiff Adolescent Period is from 5-14 Months to 2-3 Years. Bullmastiffs go through social and sexual maturity during this stage.
6. Bullmastiff Maturity Period
Bullmastiff Maturity Period is from 1 year to 4 years. At this age, your Bullmastiff will transition to full adulthood.
Male Bullmastiff Weight/Growth Chart in KG
The growth pattern of Male dogs is also different from that of Female dogs.
Adult male dogs are generally bigger in size than adult female dogs.
Below is typical growth and weight chart of a Male Bullmastiff in Kilograms (kg).
| Age | Average Weight | Typical Weight Range |
|---|---|---|
| 15 Weeks | 22 KG | 21 KG – 23 KG |
| 20 Weeks | 29 KG | 27 KG – 30 KG |
| 25 Weeks | 34 KG | 32 KG – 36 KG |
| 30 Weeks | 39 KG | 37 KG – 41 KG |
| 35 Weeks | 43 KG | 40 KG – 45 KG |
| 40 Weeks | 46 KG | 43 KG – 49 KG |
| 45 Weeks | 49 KG | 45 KG – 52 KG |
| 60 Weeks | 53 KG | 49 KG – 57 KG |
Female Bullmastiff Weight/Growth Chart in KG
The growth pattern of female dogs is different from that of male dogs. On average, female dogs grow faster than males and reach full size earlier. For this reason, it`s important that the standard height and weight charts for dogs are gender-specific.
Also, adult female dogs are generally smaller in size than adult male dogs.
Below is typical growth and weight chart of a Female Bullmastiff in Kilograms (kg).
| Age | Average Weight | Typical Weight Range |
|---|---|---|
| 15 Weeks | 20 KG | 19 KG – 22 KG |
| 20 Weeks | 27 KG | 25 KG – 28 KG |
| 25 Weeks | 32 KG | 29 KG – 34 KG |
| 30 Weeks | 36 KG | 33 KG – 39 KG |
| 35 Weeks | 40 KG | 36 KG – 43 KG |
| 40 Weeks | 42 KG | 39 KG – 46 KG |
| 45 Weeks | 44 KG | 41 KG – 48 KG |
| 60 Weeks | 48 KG | 44 KG – 52 KG |
How Much Should a 12-Week-old Bullmastiff Weigh?
The average weight of a 12-week-old female Bullmastiff is 36.8 lbs (16.7 kg).
The typical weight range of a 12-week-old female Bullmastiff is from 34.0 lbs to 39.6 lbs (15.4 kg to 18.0 kg).
The average weight of a 12-week-old male Bullmastiff is 40.2 lbs (18.2 kg).
The typical weight range of a 12-week-old male Bullmastiff is from 37.4 lbs to 42.9 lbs (17.0 kg to 19.5 kg).
However, a recent research study on dog weight shows that 12-week-old female Bullmastiffs can normally weigh as low as 34.0 lbs (15.4 kg) and as high as 39.6 lbs (18.0 kg)
Correspondingly, 12-week-old male Bullmastiffs can normally weigh as low as 37.4 lbs (17.0 kg) and as high as 42.9 lbs (19.5 kg)
How Much Should a 4-Month-old Bullmastiff Weigh?
The average weight of a 4-month-old female Bullmastiff is 49.0 lbs (22.2 kg).
The typical weight range of a 4-month-old female Bullmastiff is from 45.5 lbs to 52.5 lbs (20.6 kg to 23.8 kg).
The average weight of a 4-month-old male Bullmastiff is 52.8 lbs (23.9 kg).
The typical weight range of a 4-month-old male Bullmastiff is from 49.8 lbs to 55.7 lbs (22.6 kg to 25.3 kg).
However, a recent research study on dog weight shows that 4-month-old female Bullmastiffs can normally weigh as low as 45.5 lbs (20.6 kg) and as high as 52.5 lbs (23.8 kg)
Correspondingly, 4-month-old male Bullmastiffs can normally weigh as low as 49.8 lbs (22.6 kg) and as high as 55.7 lbs (25.3 kg)
How Much Should a 6-Month-old Bullmastiff Weigh?
The average weight of a 6-month-old female Bullmastiff is 69.0 lbs (31.3 kg).
The typical weight range of a 6-month-old female Bullmastiff is from 64.1 lbs to 73.9 lbs (29.1 kg to 33.5 kg).
The average weight of a 6-month-old male Bullmastiff is 74.2 lbs (33.6 kg).
The typical weight range of a 6-month-old male Bullmastiff is from 70.3 lbs to 78.0 lbs (31.9 kg to 35.4 kg).
However, a recent research study on dog weight shows that 6-month-old female Bullmastiffs can normally weigh as low as 64.1 lbs (29.1 kg) and as high as 73.9 lbs (33.5 kg)
Correspondingly, 6-month-old male Bullmastiffs can normally weigh as low as 70.3 lbs (31.9 kg) and as high as 78.0 lbs (35.4 kg)
How Much Should a 1-Year-old Bullmastiff Weigh?
The average weight of a 1-year-old female Bullmastiff is 103.5 lbs (47.0 kg).
The typical weight range of a 1-year-old female Bullmastiff is from 94.7 lbs to 112.3 lbs (43.0 kg to 50.9 kg).
The average weight of a 1-year-old male Bullmastiff is 113.5 lbs (51.5 kg).
The typical weight range of a 1-year-old male Bullmastiff is from 105.3 lbs to 121.7 lbs (47.8 kg to 55.2 kg).
However, a recent research study on dog weight shows that 1-year-old female Bullmastiffs can normally weigh as low as 94.7 lbs (43.0 kg) and as high as 112.3 lbs (50.9 kg)
Correspondingly, 1-year-old male Bullmastiffs can normally weigh as low as 105.3 lbs (47.8 kg) and as high as 121.7 lbs (55.2 kg)
How to Tell If Your Bullmastiff is Overweight
As mentioned earlier in this article, a very accurate way to know if your Bullmastiff puppy is on its way to becoming overweight is by weighing your dog every week and recording its weight. This will show you the growth trajectory of your Bullmastiff puppy. And a close look at your puppy`s growth trajectory will tell you if your Bullmastiff puppy will be overweight or underweight. This method is relatively easy to use.
You can use our free online tool to track your Bullmastiff puppy`s growth curve.
However, if you do not have a record of the weekly weights of your Bullmastiff, and you want to tell if your dog is overweight, underweight, or of normal weight, then you can use a chart called the body condition chart shown below. This method requires some expertise to use, and it is further discussed below.
To tell your dog`s body condition, first, look at your dog closely and observe which of its bones and structures are sticking out or not sticking out from under its skin. Next, use your hands to feel for fat and bones over your dog. To know which bones to look and feel for, check out the body condition tool guide from the World Small Animal Veterinary Association and this guide. This exercise will tell you the body condition score for your dog.
Body condition scores are from a scale of 1 to 9. A score of 1, 2 or 3 means that a dog is too skinny. A score of 4 or 5 means that a dog is of ideal weight, and a score above 5 means that a dog is overweight.
Talk to your vet if your Bullmastiff appears to be overweight. The vet might recommend reducing how much food to feed your Bullmastiff.
Conclusion on Bullmastiff Weight and Growth
In this article, we have provided you with the information, growth charts and growth calculators to help you tell how big your Bullmastiff will get. These tools will also help tell if your Bullmastiff is growing normally.
However, the best way to monitor and predict the growth of your Bullmastiff is to measure and record your puppy Bullmastiff`s weight every week.
Use our free Bullmastiff weight tracker and calculator tool available here to track and predict your Bullmastiff`s weight.
It is important that every Bullmastiff owner monitors the growth of their Bullmastiff for normal growth by checking the weight of their Bullmastiff regularly. Regular weight monitoring will let you detect any abnormal growth very early before it is too late. We discussed how you can tell if your Bullmastiff is growing normally from your Bullmastiff`s weight history earlier in this article.
Abnormal growth in Bullmastiff can be because of underlying disease (such are heart, hormonal, or bone problems) or because of overfeeding or underfeeding. All of the aforementioned reduce the Bullmastiff lifespan and quality of life.
Don`t wait. Start tracking your Bullmastiff`s weight today!