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Home Doggie News When Do Dogs Stop Growing? Key Stages and Growth Signs Explained

When Do Dogs Stop Growing? Key Stages and Growth Signs Explained

by Dan Turner
Dogs stop growing when they reach adulthood, demonstrated by this woamn and her dog.
Dan Turner

Determining when your furry friend will stop growing is a common question among dog owners. It’s fascinating to watch them transform from tiny puppies into their full-grown selves, but when exactly does this growth spurt come to an end? The answer isn’t as straightforward as you might think, as it largely depends on their breed, gender, diet, and exercise routines.

When do dogs stop growing? Most dogs’ journey from a playful puppy to a mature dog happens between 6 to 18 months. But, this timeline can stretch even longer for larger breeds. Small breed dogs like Chihuahuas might wrap up their growing by 10-12 months, while giants like Great Danes could keep growing up until they’re 2-3 years old. So, let’s jump into the specifics and see how big your dog might get and when they’ll likely reach their full size.

Factors that Affect a Dog’s Growth


First off, the breed is a huge determinant of a dog’s growth trajectory. Different breeds have their own unique growth patterns and timelines:

  • Small Breeds like Chihuahuas tap out on growing pretty early, around the 10-12 month mark.
  • Medium Breeds think Bulldogs, hit their growth ceiling by 12-18 months.
  • Large Breeds, such as Golden Retrievers, stretch their growth period up to 18-24 months.
  • Giant Breeds, including the majestic Great Danes, continue their upward and outward expansion until they’re 2-3 years old.

It’s fascinating how the genetic blueprint of each breed dictates its growth pace and ultimate size.

Size Category

Diving deeper, let’s classify our canine companions by size to paint a clearer picture:

  • Small Dogs under 25 lbs reach their full size between 6 and 12 months.
  • Medium Dogs weighing between 25 and 50 lbs grow until about 12 months.
  • Large Dogs in the 50-100 lbs range have a longer growth period, stopping around 18 months.
  • Giant Dogs tipping the scales at over 100 lbs take the longest to fully mature, often not until they’re 2-3 years old.

This categorization helps pet parents set realistic expectations for their dog’s growth and development.


Ah, genetics, the wildcard in the dog growth game. Like dealing with a hand of cards, genetics can play an unforeseen role in determining a dog’s size. It’s about the breed and the specific DNA dance between puppy parents. While breed gives us a ballpark figure, genetics can swing that number quite a bit. A few takeaway points:

  • Puppy paws are deceptive; they’re not yardsticks for predicting size.
  • Larger parent dogs often produce larger offspring, but it’s not a guarantee.
  • Mixed-breed dogs are a delightful puzzle, often landing somewhere between their mixed heritage sizes.

Understanding the genetic lottery is crucial, as it explains why some dogs might not fit the standard breed-size mold. Whether your dog is destined to be a pint-sized companion or a gentle giant, embracing their unique journey is part of the joy of pet parenthood. You’ll navigate the growth stages with more confidence and less surprise by keeping an eye on these key factors.

Stages of a Dog’s Growth

Stages of a dog's growth.


Oh, puppyhood! It’s that delightful whirlwind of fluff, energy, and endless curiosity. It all kicks off when pups open their eyes and ears to the world, taking their wobbly first steps toward discovering just about everything. This stage is not just about physical growth; it’s a critical period for:

  • Social skills development
  • Early learning
  • Bonding with humans and other pets

I can’t stress enough how vital it is to give puppies what they need during this phase. A balanced diet, regular playtime, and heaps of socialization pave the way for a well-rounded dog. And remember, consultation with a vet will tailor this care to your puppy’s specific needs.


Transitioning into adulthood, dogs hit a steady growth stride, eventually reaching their full size. The timing heavily leans on their breed, genetics, and the care you’ve lavished on them. An adult dog’s requirements shift somewhat:

  • Continued balanced nutrition
  • Regular exercise
  • Ongoing social and mental stimulation

Adulthood is a prime time to reinforce or even introduce new training. It’s a myth that you can’t teach an old dog new tricks; adult dogs often have the focus puppies lack. This stage is also about maintaining health through preventative care, so those vet check-ups are still on the agenda.


As dogs enter their golden years, their pace might slow, but their zest for life doesn’t have to. Senior dogs need:

  • Adjusted diets for changing metabolism
  • Gentle, consistent exercise
  • Regular vet check-ups to manage age-related issues

This stage is about comfort, maintaining a quality of life, and adjusting routines to fit their senior status. Seniors might need more rest, but their capacity to love remains undiminished.

In every stage of a dog’s life, the constants are care, love, and understanding. Adapting to their needs as they grow ensures they lead the happiest, healthiest lives possible.

Signs that a Dog has Stopped Growing

Physical Appearance

When my dogs finally stopped growing, it was like the last piece of a jigsaw puzzle fitting into place. Once awkwardly proportioned with too-big paws and ears, their body transformed into a picture of balance and grace. It’s easy to spot when your dog has reached its full height and weight; they simply look complete. The once continuously changing silhouette stabilizes, leaving behind a dog that moves with full-grown confidence.


Keeping an eye on the scale is also a telltale sign that growth spurts have bid adieu. During puppyhood, weight gain is as constant as the rising sun, but those numbers start to plateau as maturity kicks in. This doesn’t mean a cessation of weight management—oh no, a dog’s weight journey is lifelong—but it signals an end to their vertical and horizontal expansion. When the scale shows more stability, it’s a good indicator that your pup’s growing days are behind them.


Let’s talk behavior because, yes, even a dog’s attitude can signal they’ve crossed the threshold into adulthood. I watched my once hyperactive ball of fur morph into a dignified, laid-back companion. Well, as dignified as a dog chasing its tail can be. They still have bursts of energy, but gone are the days of endless zoomies from dawn till dusk.

  • Energy Levels: While still playful, their energy levels even out.
  • Appetite: The once insatiable hunger moderates.
  • Destructive Behavior: A decrease in chewing every shoe in sight can mean they’re out of the teething phase and more settled.

In essence, these signs are like nature’s way of saying, “I’m all grown up now.” From physical changes to shifts in weight and behavior, each clue helps us understand our canine companions a little better. Plus, it tells us when it’s time to switch from puppy kibble to adult dog food. But more than anything, it’s a reminder of the journey we’ve shared—from those first shaky steps to confident, adult dog strides.

Factors that Can Delay a Dog’s Growth

In learning about our furry friends, I’ve encountered some critical factors that might slow down their growth journey. Let’s jump into what these are.


First on the list is something I can’t stress enough – proper nutrition. 

  • What they need: Adequate calories, protein, vitamins, and minerals.
  • What you shouldn’t do: Never restrict calories in a bid to slow down your dog’s growth. Healthy development hinges on a balanced diet.

Malnutrition can result in dogs not reaching their genetic size potential. Remember, a well-fed pup is a happy, healthy pup.

Health Issues

Onto something not entirely in our control but equally important – health issues. Certain diseases can put a damper on your dog’s growth spurt, dragging out their pup stage a bit longer than usual.

Key Point: Regular vet check-ups aren’t just for vaccines; they’re crucial for spotting growth-hindering health issues early on.

Hormonal Factors

The hormonal carousel affects dogs just as it does humans. Especially noteworthy is how neutering or spaying, particularly in large breed puppies before the age of one, might slightly alter their final size.

  • Slight increase in growth: Ranging from millimeters to centimeters, depending on the breed.

Environmental Factors

 Stressful environments can affect your dog’s development, signaling their bodies to prioritize survival over growth.

  • A healthy environment equals healthy growth: Ensure your dog feels safe, loved, and stimulated for optimal growth.

In understanding these factors, we’re equipped to support our canine companions through each stage of their growth, ensuring they develop into the healthy, happy dogs they’re destined to be. Watching a puppy grow is one of the joys of pet ownership, and making sure we’re doing our part in that process is crucial.

FAQs about a Dog’s Growth

What Is the Average Growth Rate for Dogs?

Painting with a broad stroke won’t do justice here because, just like humans, every pup grows at its own pace. To streamline, let’s break down the canine world into four categories:

  • Small breeds: These little bundles of joy reach their full size remarkably quickly, often by 8-12 months.
  • Medium breeds: Sporting a bit more bulk, these dogs typically take 12-16 months to fully flesh out.
  • Large breeds: With more ground to cover, these pups usually hit their growth peak around 18-24 months.
  • Giant breeds: The titans of the dog world, taking their sweet time, can sprawl out their growth process for up to 24-36 months.

At What Age Do Dogs Stop Growing?

Understanding when your dog will stop sprouting up is like trying to nail jello to a tree—there’s no one-size-fits-all answer. But, a good rule of paw is that smaller dogs finish growing much sooner than their larger counterparts. Generally, dogs achieve their full height and weight as follows:

  • Small dogs: Might stop growing before their first birthday candle is blown out.
  • Medium dogs: Often reach full size just as they’re breaking in their teenage phase, around the 1-year mark.
  • Large and Giant dogs: These fellows are late bloomers, taking up to 2 or sometimes 3 years to fully mature.

How Can I Help My Dog Grow Correctly?

Ensuring your canine companion grows up healthy and strong doesn’t have to be a Herculean task. Here are a few vet-approved tips:

  • Balanced Diet: Feed them age-appropriate, high-quality dog food. What goes into their bowl greatly impacts their growth and health.
  • Regular Exercise: Keep them moving! Regular, appropriate exercise supports physical development and helps prevent obesity.
  • Veterinary Care: Routine check-ups with the vet are crucial. They can monitor growth and nip any potential health issues in the bud.
  • Love and Attention: Never underestimate the power of love. A happy dog is a healthy dog.

While it’s tempting to wish for your puppy to stay pint-sized forever, watching them grow into their paws and personalities is one of the many joys of dog parenthood. And while the journey from clumsy pup to graceful adult might seem to zoom by, every stage comes with its own set of delights and challenges. So, savor each moment, knowing you’re doing your best to ensure they’re growing up just right.

Support Your Furry Friend’s Growth Journey

Understanding when dogs stop growing is crucial for providing the right care at every stage of their lives. From ensuring a balanced diet and ample play during their puppy years to maintaining regular exercise and mental stimulation into adulthood, every phase demands attention.

Recognizing the signs that your dog has reached full size helps adjust their care to suit their needs better. While factors like breed size, health, and environment play significant roles, a loving and attentive approach remains key. As dog owners, it’s our responsibility to support our furry friends’ growth journeys, cherishing every moment along the way. 

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