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Quick Links: Table of Contents
- Spanish Mastiff Growth
- Spanish Mastiff Weight and Growth Chart
- When do Spanish Mastiffs Stop Growing and How Big Do They Get?
- Spanish Mastiff Growth Calculator
- How Much Should a Spanish Mastiff Weigh?
- What is the Height of the Spanish Mastiff?
- Is Your Spanish Mastiff Growing Normally? This is How to Tell
- How to Measure the Weight of your Spanish Mastiff
- How Fast Do Spanish Mastiffs Grow? Spanish Mastiff Growth Rate
- Size of Male Spanish Mastiff Versus Size of Female Spanish Mastiff
- Male Spanish Mastiff Weight and Growth Chart
- Female Spanish Mastiff Weight and Growth Chart
- Spanish Mastiff Growth Stages
- Male Spanish Mastiff Weight/Growth Chart in KG
- Female Spanish Mastiff Weight/Growth Chart in KG
- How Much Should a 12-Week-old Spanish Mastiff Weigh?
- How Much Should a 4-Month-old Spanish Mastiff Weigh?
- How Much Should a 6-Month-old Spanish Mastiff Weigh?
- How Much Should a 1-Year-old Spanish Mastiff Weigh?
- How to Tell If Your Spanish Mastiff is Overweight
- Conclusion on Spanish Mastiff Weight and Growth
Spanish Mastiff Growth
Did you just get the Spanish Mastiff puppy? And do you want to know when your Spanish Mastiff will stop growing and how big your Spanish Mastiff will get? Or do you want to know if your Spanish Mastiff is of the ideal weight for its age?
In this article, we will answer all these relevant questions related to Spanish Mastiff growth and weight.
If you do not own the Spanish Mastiff yet, make sure you purchase your Spanish Mastiff from an reputable Spanish Mastiff breeder. Also, check out our Spanish Mastiff buying guide and Spanish Mastiff price guide here.
You can also work with a reputable rescue to adopt a puppy.
It is important for you as a caring Spanish Mastiff owner to know if your Spanish Mastiff is growing normally and that your Spanish Mastiff 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 Spanish Mastiff`s weight and growth is that your Spanish Mastiff`s weight and growth pattern can tell you if your Spanish Mastiff has some underlying health conditions (such as bone, heart, hormone diseases). This is what recent research has shown.
This article contains the Spanish Mastiff growth calculator that you can use to predict your Spanish Mastiff`s adult weight. This article also contains the Spanish Mastiff growth chart and weight calculator that you can use to approximately tell if your Spanish Mastiff`s weight is in the normal range.
However, the more accurate method to predict and track normal growth in your Spanish Mastiff is by regularly weighing your Spanish Mastiff and recording the weight of your Spanish Mastiff with our free dog weight tracker and weight predictor. Our tool will tell you, first, a more accurate future weight of your Spanish Mastiff and, second, if your Spanish Mastiff 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 Spanish Mastiff weight category.
Also, check out our Spanish Mastiff food calculator here to know how much food to feed your Spanish Mastiff based on your Spanish Mastiff`s weight and age.
Spanish Mastiff Weight and Growth Chart
Below is the typical growth chart and weight chart of Spanish Mastiffs at different stages in their lives.
Note that your Spanish Mastiff 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 Spanish Mastiff.
To know how much food to feed your Spanish Mastiff at different ages and weights, check out our Spanish Mastiff feeding guide and calculator.
To know how much water your Spanish Mastiff needs to drink at different ages and weights, check out our Spanish Mastiff water drinking guide and calculator.
Note that the growth pattern of a female Spanish Mastiff can be slightly different from the growth pattern of a male Spanish Mastiff
. Therefore, later on in this article, we will provide you with the gender-specific growth chart for the male and for the female Spanish Mastiff.| Age | Average Weight | Typical Weight Range |
|---|---|---|
| 15 Weeks | 65 LBS | 48 LBS – 83 LBS |
| 20 Weeks | 84 LBS | 62 LBS – 106 LBS |
| 25 Weeks | 101 LBS | 75 LBS – 127 LBS |
| 30 Weeks | 115 LBS | 84 LBS – 146 LBS |
| 35 Weeks | 128 LBS | 93 LBS – 163 LBS |
| 40 Weeks | 138 LBS | 99 LBS – 177 LBS |
| 45 Weeks | 146 LBS | 104 LBS – 189 LBS |
| 60 Weeks | 162 LBS | 113 LBS – 210 LBS |
When do Spanish Mastiffs Stop Growing and How Big Do They Get?
Your Spanish Mastiff will grow very fast in its first 55 weeks. At 55 weeks, your Spanish Mastiff will have reached 95 percent of its adult weight. Then your Spanish Mastiff will slowly stop adding more weight. At around 68 weeks (~16 months), your Spanish Mastiff should be at its maximum weight. Spanish Mastiffs stop growing at 68 weeks (~16 months).
The above discussion is general, and it applies to both male and female Spanish Mastiffs. However, male dogs usually grow at a different rate compared to female dogs
A male Spanish Mastiff will grow very fast in its first 55 weeks. At 55 weeks, a male Spanish Mastiff will have reached 95 percent of its adult weight at 55 weeks. A male Spanish Mastiff will then slowly stop adding more weight. At around 69 weeks (~16 months), a male Spanish Mastiff should have reached its maximum weight. Male Spanish Mastiffs stop growing at 69 weeks (~16 months).
Similarly, a female Spanish Mastiff will grow very fast in its first 54 weeks. At 54 weeks, a female Spanish Mastiff will have reached 95 percent of its adult weight at 54 weeks. A female Spanish Mastiff will then slowly stop adding more weight. At around 67 weeks (~16 months), a female Spanish Mastiff should have reached its maximum weight. Female Spanish Mastiffs stop growing at 67 weeks (~16 months).
See the growth graph of a Spanish Mastiff below.
As you can see in the Spanish Mastiff growth curve below, the Spanish Mastiff grows really fast in its early weeks, and then its growth levels off till it reaches 100 percent of the adult weight.
Spanish Mastiff Growth Calculator
Use the calculator below to estimate how big your Spanish Mastiff will get based on its current weight.
This Spanish Mastiff growth calculator is based on the typical weight curve of a Spanish Mastiff shown above. The calculator assumes that your Spanish Mastiff is growing normally, and not on its way to become overweight or underweight.
How Much Should a Spanish Mastiff Weigh?
Adult Spanish Mastiffs typically weigh between 140 to 220 pounds.
Above is a graph that shows how much a Spanish Mastiff should weigh at different ages. Check where the weight of your Spanish Mastiff falls in the graph for its age.
It is totally fine if the weight of your Spanish Mastiff falls in either the dark green or light green region of the graph. However, weight in the dark green region is more typical for Spanish Mastiffs.
If the weight of your Spanish Mastiff falls outside both the dark and light green region for its age, then you should consult a vet.
Also, you can use the Spanish Mastiff weight calculator below to find the typical weight and the normal weight range of Spanish Mastiffs, male or female, of any age between 12 weeks and 100 weeks.
If you want to see how the weight of your Spanish Mastiff compares to that of other Spanish Mastiff`s of its age, enter the weight of your Spanish Mastiff in the calculator, and the calculator will show you where your Spanish Mastiff stands on the weight chart.
The calculator will also tell you if your Spanish Mastiff is within the normal weight range for the Spanish Mastiff.
This Spanish Mastiff 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 Spanish Mastiff?
The adult Spanish Mastiff is 26 to 35 inches. This is the average adult height of the Spanish Mastiff.
Is Your Spanish Mastiff 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 Spanish Mastiff will give you a clearer picture of how your Spanish Mastiff is growing.
You can use our free tool to track your Spanish Mastiff`s growth and weight over time. Our tool will also let you know if your Spanish Mastiff is growing normally.
Tracking your Spanish Mastiff`s weight will let you see the unique growth trajectory of your Spanish Mastiff. You can use this growth trajectory to accurately predict how big your Spanish Mastiff will get. The growth trajectory will also let you know very early if your Spanish Mastiff 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 Spanish Mastiffs. You can compare your Spanish Mastiff growth trajectory against these references to see if your Spanish Mastiff is growing normally or you can use our automatic tool.
How to Measure the Weight of your Spanish Mastiff
There are two methods you can use to measure your Spanish Mastiff`s weight.
The first method, which is the better and more accurate method to weigh your Spanish Mastiff, is to use a dog weighing scale.
Using a dog scale is important if you would like to monitor your Spanish Mastiff`s growth regularly to catch any abnormal growth early.
Having a scale for weighing your Spanish Mastiff will make it easy for you to weigh your Spanish Mastiff regularly without any trouble.
The scale that we recommend for weighing the Spanish Mastiff 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 Spanish Mastiff. Then use the same scale to weigh yourself without your Spanish Mastiff. Then calculate your weight when holding your dog minus your weight when not holding your Spanish Mastiff. 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 Spanish Mastiff if your Spanish Mastiff is very heavy or if your Spanish Mastiff is the type that would not stay still while being held.
How Fast Do Spanish Mastiffs Grow? Spanish Mastiff Growth Rate
Starting from 3 months of age, Spanish Mastiffs grow at a rate of 4.06 pounds per week (1.84 Kilograms per week) on average. Starting at 4 months, your Spanish Mastiff will gain 3.77 pounds (1.71 Kilograms) every week on average.
At 5 months of age, your Spanish Mastiff will grow at a rate of 3.47 pounds per week (1.57 Kilograms per week) on average. Then at 6 months, your Spanish Mastiff will gain 3.15 pounds (1.43 Kilograms) every week on average.
See the growth rate chart of the Spanish Mastiff below
| Age (Months) | Growth per week (Pounds) | Growth per week (Kg) |
|---|---|---|
| 3 Months | 4.06 | 1.84 |
| 4 Months | 3.77 | 1.71 |
| 5 Months | 3.47 | 1.57 |
| 6 Months | 3.15 | 1.43 |
| 7 Months | 2.83 | 1.28 |
| 8 Months | 2.50 | 1.13 |
Size of Male Spanish Mastiff Versus Size of Female Spanish Mastiff
The average size of a male Spanish Mastiff is 207 pounds (94 kg) while the average size of a female Spanish Mastiff is 141 pounds (64 kg).
In general, male dogs are usually bigger than female dogs.
Male Spanish Mastiff 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 Spanish Mastiff.
| Age | Average Weight | Typical Weight Range |
|---|---|---|
| 15 Weeks | 79 LBS | 75 LBS – 83 LBS |
| 20 Weeks | 101 LBS | 96 LBS – 106 LBS |
| 25 Weeks | 121 LBS | 114 LBS – 127 LBS |
| 30 Weeks | 139 LBS | 132 LBS – 146 LBS |
| 35 Weeks | 155 LBS | 146 LBS – 163 LBS |
| 40 Weeks | 168 LBS | 159 LBS – 177 LBS |
| 45 Weeks | 179 LBS | 170 LBS – 189 LBS |
| 60 Weeks | 200 LBS | 189 LBS – 210 LBS |
Female Spanish Mastiff 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 Spanish Mastiff.
| Age | Average Weight | Typical Weight Range |
|---|---|---|
| 15 Weeks | 56 LBS | 48 LBS – 64 LBS |
| 20 Weeks | 72 LBS | 62 LBS – 82 LBS |
| 25 Weeks | 86 LBS | 75 LBS – 98 LBS |
| 30 Weeks | 99 LBS | 84 LBS – 113 LBS |
| 35 Weeks | 109 LBS | 93 LBS – 125 LBS |
| 40 Weeks | 118 LBS | 99 LBS – 136 LBS |
| 45 Weeks | 125 LBS | 104 LBS – 145 LBS |
| 60 Weeks | 137 LBS | 113 LBS – 161 LBS |
Spanish Mastiff Growth Stages
Your Spanish Mastiff will go through a number of developmental stages on its journey to adulthood. Your Spanish Mastiff`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 Spanish Mastiff based on how old your Spanish Mastiff is.
1. Spanish Mastiff Neonatal Period
Spanish Mastiff Neonatal Period is from Birth to 2 weeks. During this stage, the Spanish Mastiff puppy will be totally dependent on its mother. The Spanish Mastiff puppy`s eyes will still be unopened with no sense of vision. The Spanish Mastiff puppy will only have the senses of taste and touch
2. Spanish Mastiff Transitional Period
Spanish Mastiff Transitional Period is from 2 weeks to 3 weeks. During this stage, the Spanish Mastiff 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 Spanish Mastiff 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. Spanish Mastiff Socialization Period
Spanish Mastiff Socialization Period is from 3 weeks to 14 weeks. During this stage, the Spanish Mastiff 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 Spanish Mastiff 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 Spanish Mastiff puppy learns in this stage will have a long-term effect on the puppy`s behavior as an adult.
4. Spanish Mastiff Juvenile Period
Spanish Mastiff Juvenile Period is from 3-4 Months to 5-14 months. During this stage, the Spanish Mastiff puppies will attempt to clarify and resolve their boundaries. Their baby teeth start getting replaced by adult teeth.
5. Spanish Mastiff Adolescent Period
Spanish Mastiff Adolescent Period is from 5-14 Months to 2-3 Years. Spanish Mastiffs go through social and sexual maturity during this stage.
6. Spanish Mastiff Maturity Period
Spanish Mastiff Maturity Period is from 1 year to 4 years. At this age, your Spanish Mastiff will transition to full adulthood.
Male Spanish Mastiff 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 Spanish Mastiff in Kilograms (kg).
| Age | Average Weight | Typical Weight Range |
|---|---|---|
| 15 Weeks | 36 KG | 34 KG – 37 KG |
| 20 Weeks | 45 KG | 43 KG – 48 KG |
| 25 Weeks | 55 KG | 52 KG – 57 KG |
| 30 Weeks | 63 KG | 59 KG – 66 KG |
| 35 Weeks | 70 KG | 66 KG – 74 KG |
| 40 Weeks | 76 KG | 72 KG – 80 KG |
| 45 Weeks | 81 KG | 77 KG – 85 KG |
| 60 Weeks | 90 KG | 86 KG – 95 KG |
Female Spanish Mastiff 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 Spanish Mastiff in Kilograms (kg).
| Age | Average Weight | Typical Weight Range |
|---|---|---|
| 15 Weeks | 25 KG | 21 KG – 29 KG |
| 20 Weeks | 32 KG | 28 KG – 37 KG |
| 25 Weeks | 39 KG | 34 KG – 44 KG |
| 30 Weeks | 44 KG | 38 KG – 51 KG |
| 35 Weeks | 49 KG | 42 KG – 57 KG |
| 40 Weeks | 53 KG | 45 KG – 62 KG |
| 45 Weeks | 56 KG | 47 KG – 66 KG |
| 60 Weeks | 62 KG | 51 KG – 73 KG |
How Much Should a 12-Week-old Spanish Mastiff Weigh?
The average weight of a 12-week-old female Spanish Mastiff is 45.6 lbs (20.7 kg).
The typical weight range of a 12-week-old female Spanish Mastiff is from 38.5 lbs to 52.6 lbs (17.5 kg to 23.8 kg).
The average weight of a 12-week-old male Spanish Mastiff is 65.6 lbs (29.8 kg).
The typical weight range of a 12-week-old male Spanish Mastiff is from 62.2 lbs to 68.9 lbs (28.2 kg to 31.3 kg).
However, a recent research study on dog weight shows that 12-week-old female Spanish Mastiffs can normally weigh as low as 38.5 lbs (17.5 kg) and as high as 52.6 lbs (23.8 kg)
Correspondingly, 12-week-old male Spanish Mastiffs can normally weigh as low as 62.2 lbs (28.2 kg) and as high as 68.9 lbs (31.3 kg)
How Much Should a 4-Month-old Spanish Mastiff Weigh?
The average weight of a 4-month-old female Spanish Mastiff is 59.7 lbs (27.1 kg).
The typical weight range of a 4-month-old female Spanish Mastiff is from 51.5 lbs to 67.8 lbs (23.4 kg to 30.7 kg).
The average weight of a 4-month-old male Spanish Mastiff is 83.9 lbs (38.1 kg).
The typical weight range of a 4-month-old male Spanish Mastiff is from 79.6 lbs to 88.3 lbs (36.1 kg to 40.0 kg).
However, a recent research study on dog weight shows that 4-month-old female Spanish Mastiffs can normally weigh as low as 51.5 lbs (23.4 kg) and as high as 67.8 lbs (30.7 kg)
Correspondingly, 4-month-old male Spanish Mastiffs can normally weigh as low as 79.6 lbs (36.1 kg) and as high as 88.3 lbs (40.0 kg)
How Much Should a 6-Month-old Spanish Mastiff Weigh?
The average weight of a 6-month-old female Spanish Mastiff is 84.0 lbs (38.1 kg).
The typical weight range of a 6-month-old female Spanish Mastiff is from 72.8 lbs to 95.3 lbs (33.0 kg to 43.2 kg).
The average weight of a 6-month-old male Spanish Mastiff is 117.5 lbs (53.3 kg).
The typical weight range of a 6-month-old male Spanish Mastiff is from 111.3 lbs to 123.6 lbs (50.5 kg to 56.1 kg).
However, a recent research study on dog weight shows that 6-month-old female Spanish Mastiffs can normally weigh as low as 72.8 lbs (33.0 kg) and as high as 95.3 lbs (43.2 kg)
Correspondingly, 6-month-old male Spanish Mastiffs can normally weigh as low as 111.3 lbs (50.5 kg) and as high as 123.6 lbs (56.1 kg)
How Much Should a 1-Year-old Spanish Mastiff Weigh?
The average weight of a 1-year-old female Spanish Mastiff is 132.4 lbs (60.1 kg).
The typical weight range of a 1-year-old female Spanish Mastiff is from 109.8 lbs to 155.1 lbs (49.8 kg to 70.4 kg).
The average weight of a 1-year-old male Spanish Mastiff is 191.6 lbs (86.9 kg).
The typical weight range of a 1-year-old male Spanish Mastiff is from 181.5 lbs to 201.6 lbs (82.3 kg to 91.4 kg).
However, a recent research study on dog weight shows that 1-year-old female Spanish Mastiffs can normally weigh as low as 109.8 lbs (49.8 kg) and as high as 155.1 lbs (70.4 kg)
Correspondingly, 1-year-old male Spanish Mastiffs can normally weigh as low as 181.5 lbs (82.3 kg) and as high as 201.6 lbs (91.4 kg)
How to Tell If Your Spanish Mastiff is Overweight
As mentioned earlier in this article, a very accurate way to know if your Spanish Mastiff 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 Spanish Mastiff puppy. And a close look at your puppy`s growth trajectory will tell you if your Spanish Mastiff puppy will be overweight or underweight. This method is relatively easy to use.
You can use our free online tool to track your Spanish Mastiff puppy`s growth curve.
However, if you do not have a record of the weekly weights of your Spanish Mastiff, 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 Spanish Mastiff appears to be overweight. The vet might recommend reducing how much food to feed your Spanish Mastiff.
Conclusion on Spanish Mastiff 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 Spanish Mastiff will get. These tools will also help tell if your Spanish Mastiff is growing normally.
However, the best way to monitor and predict the growth of your Spanish Mastiff is to measure and record your puppy Spanish Mastiff`s weight every week.
Use our free Spanish Mastiff weight tracker and calculator tool available here to track and predict your Spanish Mastiff`s weight.
It is important that every Spanish Mastiff owner monitors the growth of their Spanish Mastiff for normal growth by checking the weight of their Spanish Mastiff 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 Spanish Mastiff is growing normally from your Spanish Mastiff`s weight history earlier in this article.
Abnormal growth in Spanish Mastiff 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 Spanish Mastiff lifespan and quality of life.
Don`t wait. Start tracking your Spanish Mastiff`s weight today!
