What Age Do Pitbull’s Reach Full Size [Growth Chart & Facts]


A Pitbull makes one of the most loyal and protective guard dogs you can decide to adopt, but it is essential to understand what age a Pitbull will reach full size and how much a Pitbull should weigh as they mature and grow.

This helps you to understand if your Pitbull is growing at the standard and acceptable rate and allows you to keep tabs on if your Pitbull is remaining at ideal weights and healthy.

I have been a Terrier Owner for over 2.5 years, and here is what I can tell you on this topic.

What Age Do Pitbull’s Reach Full Size?

Pitbull’s will reach their full height potential by 18 months old and will mature to their potential weight between the age of 2 and 3. Pitbull Terriers will grow the most rapidly between the ages of 4 and 9 months of age, and factors such as diet, exercise, and genetics can impact your Pitbull’s overall size.

I realized as typing this out that this only answers 1 small question when it comes to what you can expect with a Pitbull Terrier and that you may have a lot more questions about a Pitbull’s growth curve, height, and weight.

To accommodate, I plan to break this down in much more depth and include a height and weight chart based on a Pitbull Terriers age and gender.

Consider this your ultimate guide for understanding how your Pitbull will grow, what the ideal weights for your Pitbull look like, and just how big your new Pitbull puppy will get.

Here is how I intend to present the information for you today:



Pitbull Growth Chart, Growth Expectations, and Growth Explanations


To streamline some of this information, I want to begin with a chart breaking down the weight ranges you can expect your Pitbull to reach certain intervals that you can view directly above.

Age Of Pitbull TerrierAverage Weight MaleAverage Weight FemaleGrowth Remaining?
1 Week6-10oz7-11ozYes
8 Weeks7-14lbs6-12lbsYes
3 Months10-20lbs9-18lbsYes
4 Months25-38lbs20-35lbsYes Rapid Growth
6 Months30-40lbs26-36lbsYes Rapid Growth
8 Months45-63lbs40-59lbsYes, Growth Begins To Slow
1 Year Old49-70lbs42-64lbsYes, Your Pitbull Will Still Continue to Fill Out Weight
Pitbull Terrier Growth Chart

You Have A Few Different Breeds of Pitbull’s

Another thing you need to keep in mind when generalizing the information about a Pitbull’s maximum weight and even height is the breed-specific genetics of the dog you are referencing.

Pitbull’s seem to be often lumped together into one name or often always referred to as the Pitbull Terrier.

You have several different potential breeds of Pitbull’s that include the following:

  • American Pitbull Terrier
  • American Staffordshire Terrier
  • Staffordshire Bull Terrier
  • American Bully

Chart of Average Weight and Sizes Of Different Pitbull Terrier Breeds

Type of Pitbull TerrierAverage Weight Of Pitbull Terrier Breed
American Pitbull Terrier30-65lbs
American Staffordshire Terrier40-70lbs
Staffordshire Bull Terrier24-39lbs
American Bully31-56lbs
4 Breeds of Pitbull Terrier’s Average Weight and Growth Chart

The above chart is a quick breakdown of the averages of each of the primary 4 Pitbull Terrier breeds.

I simply wanted to mention and reference these breeds because they are often lumped or called Pitbull Terriers by the average person considering adopting a dog in the future.

For the sake of the rest of this brief guide, we will be discussing and covering the American Pitbull Terrier.


How Big Is a Pitbull Puppy When They Are Born?

A few factors will impact the size of a Pitbull when they are born.

These factors include things such as the size of the mother Pitbull Terrier and how many other Pitbull’s are being born in the same litter.

Typically, a 1-week old Pitbull will weigh anywhere between 7 and 10oz, which is roughly ½ of a pound.

Yep, you read that right, A Pitbull Terrier starts their young life and journey at a small 7-10oz, and the growth begins to accelerate rapidly at roughly 4 months of age.


How Big Is a Pitbull Puppy At 8 Weeks?

8 weeks is a significant milestone for your Pitbull puppy.

This is when your Pitbull is now eating puppy food and beginning the transition away from their mother.

While this is encouraging for those of you that you are eager to pick your new Pitbull, it is essential to wait until at least 8 weeks to do so for the correct development and transition to take place.

At this age, your Pitbull is likely to eat 3-4 small meals per day as they transition away from their mother and weighing in around 6-10lbs.


How Big Is a Pitbull at 3 Months?

When a Pitbull reaches the age of 3 months old (12 weeks), things begin to change again for your Pitbull Terrier.

At this age, the meals can be separated into 2-3 meals per day, but you need to keep an eye on your Pitbull during this switch to ensure that they do not suffer from any upset stomachs.

At 3 months of age, a Pitbull Terrier will weigh between 13-19 pounds.

While this may seem relatively light for a muscular Pitbull Terrier, keep in mind, the significant growth for your Pitbull and weight gain is right around the corner.


How Big Is a Pitbull at 4 Months?

At 4 months old, your Pitbull is starting to take the form of their known muscular body and larger weight.

Most Pitbull Terriers, at 4 months of age, will be approaching 25-40lbs in weight.

Again, remember, these ranges exist because of the factors we mentioned at the beginning of this guide.

Genetics, exercise, and even the diet will play a role in the weight your Pitbull is at when they are 4 months of age.

We will also touch on some of the specifics on ranging weights further into this post so be sure to keep reading.


How Big Is a Pitbull at 6 Months?

Now, we skip ahead to the 6-month mark when your Pitbull is capable of only eating 2 meals per day, and your Pitbull is beginning to reach their max size and weight more rapidly.

At 6 months old, a Pitbull Terrier will be roughly 60% of its full size and weight.

Yep, 40% left to go until your once adorable Pitbull puppy is the muscular full-grown dog, they have been working towards becoming.

At 6 months of age, a Pitbull Terrier should weigh in between 30-40lbs.


How Big Is a Pitbull at 8 Months?

At 8 months old, a Pitbull Terrier will begin weighing between 35-50 pounds depending on several factors.

Your Pitbull has also sprung in size even more since the 6-month age range.


How Big Is a Pitbull at 1 Year Old?

Now is when you are really getting a good idea of how much your Pitbull will weigh going forward, assuming you do a good job maintaining your Pitbull’s weight and providing the best diet and exercise.

At 1 year old, a Pitbull Terrier will be weighing between 45-65 pounds.


Factors That Can Impact How Big Your Pitbull Will Be and How Fast They Will Grow

Now that we have a general idea of how much a Pitbull will weigh and what ages your Pitbull Terrier will begin reaching these weights, it is important to cover what factors will impact how big your Pitbull ultimately gets.

Here is a look at 3 of the most common factors that will impact the overall size and weight of a Pitbull Terrier.


#1- Genetics Will Impact the Overall Size and Weight of Your Pitbull

Genetics play a huge part in how much your Pitbull will weigh and how they will ultimately grow.

If the mother of your Pitbull Terrier and the father of your Pitbull are on the smaller side, you can expect to be raising a smaller Pitbull.

On the flip side, if your Pitbull has parents on the larger or even much more muscular end of the spectrum, you can expect to achieve the same size and weights as your Pitbull.

Keep in mind that genetics also factor into the price you will ultimately pay for your Pitbull Terrier at the time of the adoption.

Often, strong bloodlines or larger Pitbull’s may cost you more out of pocket to adopt.


#2- Exercise Will Play a Critical Role

All dogs need exercise, which certainly includes the Pitbull Terrier.

Depending on how much exercise you can provide your Pitbull, you may experience different weights than other Pitbull’s you read about or see.

It is necessary for this dog, and they love to partake in any form of exercise or training you are willing to provide.

This can include activities such as the following:

Not only is this going to help with socialization for your Pitbull beginning at young ages, but it is also going to help with some of the negative behaviors that a Pitbull may display.

The exercise can help your Pit to release built-up energy, which can cause behaviors such as excessive barking or excessive chewing.

Especially when they are young puppies.

Be sure to provide plenty of exercises not only to keep your Pitbull at ideal weights and size but to help your Pitbull develop into the excellent and loyal dog they can become.


#3-Diet Is Always A Factor for Your Pitbull Terriers Size and Growth

Diet is perhaps the most crucial factor you need to account for when monitoring your Pitbull’s weight and growth.

A high-quality diet is imperative.

You can either make this decision for yourself, speak to the breeder that sold you your Pitbull or consult with a vet.

Nonetheless, a high-quality diet can make or break your Pitbull’s ability to remain at the proper weights and have a direct impact on your Pitbull’s overall growth and development.


Is My Pitbull Terrier A Healthy Weight?

Determining if your Pitbull is a healthy weight can be easier said than done and likely will need a vet to assess accurately.

Obviously, if you have a full-bred Pitbull Terrier and your Pitbull is growing based on what we have laid out for you thus far, you are likely in good shape.

You can also use the eye test to determine if your Pitbull Terrier is remaining at ideal weights.

At younger ages, it is completely normal to see the outline of your Pitbull’s ribs, but as they age, the outline should be harder to notice.

If your Pitbull seems like they are overweight, you need to consider providing more exercise or changing your Pitbull’s diet.

Some Pitbull owners even switch to raw-meat diets to keep their Pitbull’s as lean as possible.

This does not mean you necessarily need nor should do this, but this gives you an idea and an example of how this can vary for each Pitbull.

Keep tabs on your Pitbull as they grow and get yearly check-ups and advice from your vet if you are ever unsure.

Ultimately, your Pitbull’s health and happiness are priority number 1.


When Do Pitbull’s Stop Growing?

Most Pitbull Terriers will continue to fill out and gain some additional weight until they are about 2-3 years old.

While they may be full-grown height wise before the age of 2, most Pitbull’s have not reached their peak weights until this 24-36 month of age.

If your Pitbull is past 3 years old and is experiencing weight gain issues, you may need to consult a vet, consider a change in diet, or begin providing more exercise.


Other Pitbull Terrier Mixes Will Also Vary in Size

The last thing I want everyone reading to keep in mind is that if you do not have a full-bred Pitbull Terrier or your Pitbull is a mix with another dog breed, the weights we have discussed, and overall size can vary dramatically.

Depending on what mix your Pitbull is, your dog may exceed the weights we have discussed or been full-grown at a much younger age.

Be sure to search for specifics based on your Pitbull mix to get the most accurate information or speak to a vet near you.


Make Sure Your Pitbull Remains at Ideal Weights for Optimal Health and Happiness

As you can see, your loving and affectionate Pitbull is small at first but hits a rapid growth spurt in weight and height at around the age of 4 months.

From there, the average weight of a Pitbull Terrier can vary based on several factors, but hopefully, this brief article has broken down actionable steps and things to keep in mind so that you can use to ensure your Pitbull remains at the most ideal weights.

If you ever have concerns about your Pitbull’s size, growth, and development or weight, be sure to consult with a local vet and get a second opinion.

Provide a well-balanced and high-quality diet and ensure your Pitbull Terrier gets plenty of exercise and love, and you will be in great shape.

Luna and I wish you the best of luck with your Pitbull’s and the journey you have ahead of you!


Do You Have Any Further Recommendations You Can Share with The Readers About A Pitbull’s Average Weight or Size?

How big is your Pitbull Terrier, and how old are they currently?

Do you have any other recommendations or advice for the readers about a Pitbull’s ideal weights and size?

Be sure to share those thoughts, stories, and concerns by dropping a comment below.

As always, Luna and I appreciate you stopping by and reading today, and we will see you again next time.

Josh Martin- Founder and Creator of Terrier Owner

Josh Martin is the proud owner of a female Jack Russell Terrier Named Luna. Josh founded TerrierOwner.com to share the stories of owning a Terrier and to help all terrier owners with the struggles, excitement and common questions that come with being a new terrier parent.

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