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When Do Puppies Stop Growing?

When Do Puppies Reach Their Full Size? Puppy Growth Guide 2023
Published Monday, January 30, 2023 by Elena R.

Puppies are the cutest thing on earth, especially when they are young, tiny, and fluffy. It's unreal how quickly they can give you puppy fever and make you fall head over heels. Most puppy owners adore the puppy phase, and furthermore, most wish their puppies would stay that small and adorable. And some puppies do, like the teacup of other very small varieties. Maltipoos and teacup Pomeranians are among the breeds that tend to remain small, even after their growing phase. Others like the Mini Goldendoodle, Pomsky, and Cavapoo transition from adorable puppies to gorgeous adults.  

When you bring home a new puppy, it's hard not to be fascinated by how quickly they change and grow. But have you ever wondered when your furry friend will stop growing? Understanding puppy growth can help you ensure that your pup is healthy and happy and it can also give you an idea of what to expect as they grow into adulthood.  

In this blog post, we'll explore the factors that affect puppy growth, the milestones you can expect, and how to monitor your pup's progress. Whether you're a new puppy parent or just curious, this guide will give you the information you need to understand your furry friend's growth. 

Factors that Affect Puppy Growth 

a human hand holding a young puppy

Puppy growth is influenced by a variety of factors, including breed size and genetics, nutrition and exercise, and hormonal and health issues. Purebred and mixed breeds can have very different growth rates and ultimately more factors that go into their adult size.  

Breed size and genetics 

The size of a puppy's breed plays a big role in determining how large they will get. For example, a Great Dane puppy will grow to be much larger than a Chihuahua puppy. Purebred puppies have a specific breed standard that will tell you exactly what to expect in terms of adult size. However, when it comes to mixed breeds, especially those that have different-sized parents, determining their adult size during puppyhood may be more difficult. In this case, it’s always best to speak to the breeder or look at similar dogs in the breed and see how they evolved in terms of adult size. 

Nutrition and exercise 

Although at first glance it may not seem important, nutrition and exercise both play a big role in a puppy’s natural growth. Underfed or under-exercised puppies may not develop properly or reach their full potential when it comes to adult size. 

A healthy diet and regular exercise are essential for a puppy's growth and development. Feeding your puppy a balanced diet that provides all the necessary nutrients can help them grow at a healthy rate. Regular exercise can also help them build muscle and maintain a healthy weight. 

Hormonal and health issues 

Hormonal imbalances or health conditions can affect a puppy's growth. For example, if a puppy is suffering from hypothyroidism, a condition in which the thyroid gland does not produce enough hormones, it can result in slower growth. It's important to consult with a veterinarian if you notice any unusual symptoms or have concerns about your puppy's growth. 

RELATED: Puppy Feeding 101: A Comprehensive Guide for Raising a Healthy Pup 

Puppy Growth Milestones 

cute white Pomeranian puppy

Puppies go through several stages of growth as they develop into adults. Here are some milestones you can expect to see as your puppy grows: 

Birth to 8 weeks: During this stage, puppies are primarily focused on eating and sleeping. They will begin to develop coordination and socialization skills, and their eyes and ears will open. They will also start to double their birth weight. 

8 weeks to 6 months: This is a critical period of growth and development for puppies. They will begin to explore their surroundings, learn basic commands, and start teething. Their bones will also start to harden, and they will start to gain muscle mass. 

6 months to 1 year: Puppies will reach their physical maturity during this stage, although they will continue to fill out and gain muscle mass. They will also reach mental maturity and be able to learn more complex commands and tasks. 

1 year and beyond: After one year, most puppies have reached their full size, although some breeds may continue to grow and fill out until they are 2 or 3 years old. 

RELATED: How Big Will My Puppy Get? 

How to Monitor Your Puppy's Growth 

brown labrador puppy

Monitoring your puppy's growth can help you ensure that they are healthy and developing properly. Here are some ways to do this: 

  • Measuring and weighing your puppy regularly: Keeping track of your puppy's weight and measurements can give you an idea of how they are growing. You can weigh your puppy using a bathroom scale or measure their length and height using a tape measure. 
  • Comparing your puppy's size to breed standards: Each breed has an expected size range, and comparing your puppy's size to the standards for their breed can give you an idea of whether they are growing at a normal rate. 
  • Consulting with a veterinarian: A veterinarian can give you a professional evaluation of your puppy's growth and development and can help you identify any potential problems. They can also provide guidance on feeding and exercise, as well as recommend any necessary medical treatments. 
  • Speaking to the breeder: A reputable breeder will give you all the information you need about your puppy’s estimated adult size, genetics, and the size of the parents. 

RELATED: 7 Ways to Identify a Responsible Breeder 

Common Concerns and Questions about Puppy Growth

tricolor cavalier King Charles spaniel puppy

As your puppy grows, you may have some concerns or questions about their development. Here are some common issues that puppy owners may face: 

Is my puppy growing too fast or too slow? A puppy that is growing too fast may be at risk for health problems such as hip dysplasia, while a puppy that is growing too slowly may not be getting the nutrients they need. Comparing your puppy's growth to breed standards and consulting with a veterinarian can help you determine if your puppy's growth rate is normal. 

How can I ensure that my puppy reaches its full potential size? Providing your puppy with a healthy diet and regular exercise, as well as consulting with a veterinarian, can help ensure that your puppy reaches their full potential size. 

What should I do if my puppy has a growth problem? If you suspect that your puppy has a growth problem, such as a hormonal imbalance or health condition, it's important to consult with a veterinarian. They can help diagnose and treat any issues, as well as provide guidance on how to manage any conditions that may affect your puppy's growth. 

RELATED: New Puppy Owner Guide 


Puppy growth is a fascinating process that can give us an idea of what to expect as they grow into adulthood. Understanding the factors that affect puppy growth, the milestones you can expect, and how to monitor your pup's progress, are key to ensuring your furry friend is healthy and happy. In this blog post, we've explored the different stages of puppy growth, the factors that can affect it, and how to monitor your puppy's development.  

It's important to remember that each puppy is unique and may grow at a different rate, but by understanding the general guidelines and consulting with a veterinarian, you'll be able to provide the best care for your furry friend. Remember, monitoring your puppy's growth can give you peace of mind and help you ensure that your pup reaches their full potential size. 

Elena R.

About The Author

Elena is a leading expert in the field of dog behavior, care, and training, with over a decade of experience in writing about dogs. As a published writer and lifelong dog enthusiast, Elena currently shares her home with three beloved canine companions. She is dedicated to staying up to date on the latest advancements in dog care and training, ensuring that her articles provide readers with accurate and valuable insights. With her extensive knowledge and passion for all things canine, Elena's contributions to the Premier Pups community offer both expertise and authority on a wide range of dog-related topics.
Elena R. - Author Photo

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Frequently Asked Questions

Can a puppy have stunted growth? Yes, a puppy can have stunted growth due to various reasons such as malnutrition, genetics, illnesses, or certain hormonal imbalances.

What months do puppies grow the most? Puppies grow the most during their first 6-12 months of life, with the most rapid growth occurring during the first 4-5 months.

How long does it take for a puppy to become fully grown? The time it takes for a puppy to become fully grown depends on its breed, but generally, small breeds reach full maturity at around 10-12 months of age, while large and giant breeds can take up to 2 years to fully mature.