How Big Will My Puppy Be – Height, Weight Chart & Calculator

A Quick Guide to Understanding Puppy Growth

Whether you gave in to your impulse or spent months planning, you now have an adorable little addition to your family. While you plan for its needs and requirements- how much food it will consume, how big a bed it will need, how much exercise it will require- you may wish to estimate how big your puppy will grow eventually.

Gathering knowledge about your furry friend will equip you to better care for it. As tiny and cute as it looks now, the fact is that your little guy is going to grow- and pretty quickly!

When it comes to dogs, there are two main deciding factors for their size- their age as well as their breed.

The growth of a puppy is directly related to its weight. When the growth cycle is finished, an average adult dog usually weighs around twice the original weight it had at four months of age. Larger breeds typically double the weight they reach at five months of age.

How Your Puppy Will Develop From Birth to Twelve Weeks


Several studies across various countries place the average growth time rate of a medium-sized dog between nine to ten months overall. Larger breeds take longer (from twelve to eighteen months). The only ones with a non-measurable growth rate are truly gigantic dogs such as Mastiffs, Grand Danes, and Rottweilers, who can keep growing well until they are three years old.

This article has been written with the purpose of offering guidance on every aspect related to the growth of your puppy, with suggestions on how best to care for your furry friend. While attention is essential on the owners’ side, it is important to consult a good veterinarian for professional advice.

How Big Will My Puppy Be?

Quick fact: all puppies grow incredibly fast! 

Being prepared for the moment your puppy becomes a full-fledged dog is pretty significant because you need to be ready with adequate space for it as well as all the equipment it will need when it reaches its set size. Your vet can give you some insight into their habits, given their breed.

Just like any animal out there, different dogs have different needs given their size and breed. A German Shepherd does not require the same things as a Corgi, so there is no such thing as a one-size-fits-all solution to provide for them. 

Before we start calculating the dog’s predicted height and weight, let’s look at an interesting video about the 7 stages of puppy growth and development:

7 Stages of Puppy Growth and Development - Dog Years


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Can I Check the Height of My Puppy Using a Weight Calculator?

Basic Calculation:

As we mentioned earlier in this article, there is a basic procedure for this: an adult dog will double the weight they have at four months of age.  

To put it in layman terms: if your 4-month old puppy weighs four pounds, it will weigh about eight pounds when it reaches adulthood, and this weight will be evenly distributed along its body.

One week after being born, your puppy should weigh twice what it weighed at the moment it was born. It should also have doubled its size by then. Average dogs increase their weight by five ounces a week, and their growth rate goes according to this development. Larger breeds experience this process more quickly since their weight gain is roughly 2.5 pounds a week.

Using an Online Calculator:

Although the math to calculate the estimated weight of your puppy is not that hard, it can get very tiring, very quickly. You may need to keep checking this information periodically for health reasons, or because you are simply conscious about the state of your puppy’s development.

There are many computer-generated options that help you calculate your puppy’s estimated weight online. The most accessible one seems to be the one provided:



The usual information required by these weight estimator tools is listed below:

  • Breed of the puppy
  • Date of birth of the pup
  • Last weight date of the puppy
  • Current weight in pounds

What Age Is a Dog No Longer a Puppy?

If we consider scientific input, most studies show that a dog is viewed as a puppy from the moment he’s born until he completes one year or 365 full days of age. They go through several stages of development very quickly, but they still need human assistance if they are under human care. Newborn puppies look tiny and helpless when they come to this earth, but they undergo a drastic transformation in the span of a year.

How Long Does It Take for a Puppy to Be Full Grown?

There is a particular correlation between the height of a dog and its weight. While in most dogs this process is evenly distributed, the final results will need a brief time of adjustments to settle completely.  

A few puppies reach their full height before their full weight. An average puppy that is four months old usually shows 60% of their full height and has 30% of their total weight. This certainly makes for an awkward look that is especially noticeable in larger breeds.

How long does it take for a Puppy to be Full Grown

Even with these acknowledged figures out there, your puppy might reach a full height at a different moment. Breed and age play a significant role in these occurrences.

This is how it usually plays for some of the most well-known breeds out there:

  • Small breeds, also known as toy-like dogs due to their size, reach their full size in no less than ten months, and no more than one year.
  • Medium-sized breed puppies, like Corgi or Beagles, stop growing at fifteen months, and their ideal weight is reached after eighteen.
  • Large breeds like German Shepherds, Dobermans, or Golden Retrievers, reach a full height at sixteen months. They can also gain more weight for up to two years, anything beyond that is considered unhealthy.
  • Giant Breeds: There are some particular giant breeds, like St Bernards, Mastiffs or Great Danes that can reach their full height after eighteen months. Their ideal weight is fully reached after three years.

When Do Puppies Grow the Most?

Science offers an easy answer to this question. The quick answer is that most of the growth and body development in puppies happens from the moment they are born to six months of age. The average periods where the most rapid growth rate occurs has been measured as follows:

  • Small breeds:  0 to 11 weeks
  • Medium breeds: 0 to 16 weeks
  • Large breeds: 0 to 20 weeks
  • Giant Breeds: 0 to 25 weeks

Small breeds are the ones that develop faster. They also reach maturity the earliest.

Large and giant breeds’ development is prolonged; their maturity is likewise.


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When your puppy reaches at least 65% of its height, its growth rate will decline, and it will be hard for you to tell if it is growing any larger. Another important thing to keep in mind, advises the Crazy Pet Guy, is that the growth of your puppy depends on its diet, and not every puppy has the same nutrition needs.

How to Tell How Big a Mixed Puppy Will Get?

This is a frequent question for people who adopt their dogs from shelters, given the fact that most such dogs are mixed breed. The process can be a tad difficult and a little expensive, but if it is important for you to know, you can ask your vet to run a DNA test to get the exact information for you.

How Can I tell you how big my mixed puppy will get

The test consists of a thorough study of a blood sample of your puppy for all the traces that can pinpoint their breed of origin. The analysis usually takes two weeks, and along with a size estimation, it can indicate if your dog is prone to have a medical condition.

If such a complex test is too expensive or time-consuming for you, there are other things you can notice about your new friend that can give you a hint at how big he will be, such as:

Their Paws

Many grandmothers used to predict the height of their grandkids just by taking a look at their feet. You can apply that method with your puppy too! A small-sized paw indicates that your dog will be average-sized. A young dog with a larger-than-average sized paw is probably going to grow big.

The reasoning behind paws as an indicator of size is that a dog would ideally have sufficiently big paws to handle its weight and size. However, this method of predicting a dog’s full-grown size is not very accurate, especially in mixed breed dogs.

Their Skin

If you catch a glimpse of loose skin on your puppy’s, it’s probably because he will grow into it in the future. Large saggy skin bags are signs of future growth. Small loose skin bags indicate it is a smaller breed. Again this is not a blanket rule and the type of skin can be affected by the DNA of the puppy to some extent.  

The Height of the Puppy’s Parents

This one is pretty uncommon, but not impossible to check, especially if you live in the country and your puppy is given to you by a farmer or a local shelter. You can always ask the person giving out the dog for adoption about the height of the parents to determine the adult height of the one you have.

Bear in mind that the mother usually carries the dominant genes. Again, DNA structure might influence the outcome of this mean of prediction.

More Factors that Define a Pup’s Growth

Apart from the factors we discussed so far, there are some additional factors that can affect a pup’s growth and final size.  

The Pup’s Gender

Apart from the type of breed, gender is another major deciding trait when it comes to a dog’s size and weight. A female puppy is more likely to be the size of her mother, while a male puppy is more likely to get its father’s size.


Neutering can affect the size of your puppy as he reaches adulthood. This happens because sex hormones regulate their growth. A neutered dog can grow a little bit larger than others specimens of his own breed. They can also be prone to pack more weight.

While we have established that most dogs reach maturity after a year, most vets recommend waiting two or three years until the body of the dog is sufficiently developed to perform the surgery.


At the end of the day, a dog’s final size is also going to depend on its diet. A balanced, healthy diet can help a puppy achieve its ideal weight and size, while underfeeding could lead to malnutrition while overfeeding could lead to an over-weight puppy.

How Your Puppy Will Develop From Birth to Twelve Weeks?

Keeping track of your puppy’s development can be very exciting, especially if you are well informed on the matter.

Neonatal Period – Age: Newborn to Two Weeks

  • At this stage, most puppies can feel touch and taste everything, but not much else. During this time they are mostly stimulated by the mother or the surrogate taking care of them.
  • They also begin to learn basic social skills and they get their first perceived notions of coordination on their surroundings.
  • Most of what puppies do during this time is drink milk every two hours, so if you are playing surrogate be ready to feed them following that schedule.  

Transition Period – Age: Two to Four Weeks

  • After two weeks being properly nurtured most puppies open their eyes for the first time.
  • Most breeds try to stand and take a walk for the first time, their sense of smell and hearing gets enhanced very quickly so their perception is increased and they act upon it.
  • They also start to wag their tails, and teeth begin to appear in their mouths. Some of them try their barks for the first time.
  • After the four weeks are passed, they will understand the concept of relieving themselves.
  • They will also be able to see correctly.   

Social Period – Age: Four to Twelve Weeks

  • This is the moment when they can begin to interact with other people and other dogs.
  • They will be able to understand the concept of running around, and they will undoubtedly get joy out of their surroundings, so this is the best moment to teach them how to play with certain toys.
  • Most of their behavior is determined by the stuff they learn during this precise period.
  • Some vets recommend leaving them with their mothers up until eight weeks so that they are able to understand certain concepts such as biting and interaction with littermates.
  • After week eight is the ideal time to begin housetraining your puppy. It will experience some fear for a few days with every new challenge it has to face, but by week twelve, it should have developed social skills to get along with humans and littermates alike.

Rank/Seniority Classification Period – Age: Three to Six Months

  • This is a period of intense learning and absorption for your puppy. It is likely to learn everything that will define its traits in the future. You can get it to learn basic notions of submission and dominance to establish its relationship with everything surrounding him.  
  • Most of its curiosity will be satisfied by biting and chewing everything. It is up to you to make it learn what it can and can’t bite.
  • Don’t be afraid to teach by example. Dogs are pretty conscious of the patterns they follow when imitated by humans.

Adolescence – Age: Six to Eighteen Months

  • During this time your puppy is now able to understand its place in the pack (your family) Its behavior will be affected by everything happening in its surroundings.
  • It can learn voice commands now, but it will also be more prone to explore everything that happens around it.
  • Beware though: it will also challenge authority to explore the boundaries of its dominance, so this stage is also the best moment to correct undesirable behaviors.   
  • If your puppy is not spayed or neutered, they will also show their first signs of sexual attraction at this stage, usually within the seventh and ninth month.

After reading most of this information, you would now have a good idea of what is in store for you with your puppy. You can prepare yourself for the wonderful adult your little furry friend is going to become. Make sure to always have your vet a phone call away to make sure you are doing everything as you should.

3 thoughts on “How Big Will My Puppy Be – Height, Weight Chart & Calculator”

  1. most vets recommend to wait with spay and neuter until age 2-3 …?? That is insane … it that were true – we would have even more of a pet over-population that we already have. The science behind ” fixed dogs grow larger” is a bit fuzzy and there have been very few studies done! In the US … a LOT of dogs are given up by their owners due to unwanted behavior directly caused by not fixing their pet before puberty …one has to ask what is preferable: a dog that grows larger and might or might not have mild side effects from castration … or … lots of unwanted puppies that have to be euthanized and adult dogs that mark, bark and wander and are also put down … all my dogs have been ” fixed” at 3 months – we currently have our 6th puppy … my dogs lived happy and healthy into their mid teens … 16, 17 and 14 years old and all of them pretty spry until the very end … Tired of hearing the ” fixing early might cause health issues” argument … it is more likely that an intact dog dies early due to breeding ” accidentally”, running away or ending up in a kill shelter than due to castration surgery!

  2. your Calculator is so wrong or I’m to dumb to use it I fill in the current weight and age and it says my dog will weigh like 4420 pounds as an adult. he is 85lbs now at 10 months.i put in 85 as his weight and 1 as age because that’s the closest thing to his age.. Is this common core math? my car doesn’t even weigh 4400 pounds

    • Hi Shane. Request you to please look closely. You need to fill in the age in weeks, and not years. So for a 10 month old puppy, I’d fill in 40 weeks (43, if you want to be really precise). You put in those numbers and you will get the right answer. It is just a tool, Shane. Garbage in = garbage out.

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