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When Do Dogs Stop Growing? (2023 Sizes & Breeds Guide)

Deborah R Fletcher
  Mar 26, 2023 9:59 AM

Regardless of age or breed, bringing home a new puppy is one of life's greatest pleasures. Puppies are typically the most popular option for families seeking a family pet, with owners eager to see their little bundle of joy develop and bond with the family.

Yet turmoil might swiftly ensue if the mixed-breed dog your family adopted continues to develop. When should you anticipate your puppy's growth to cease?

Let's examine puppy development and how to predict when your dog will stop growing in "When Do Dogs Stop Growing? (2023 Sizes & Breeds Guide)" by BestForPets (

When Do Dogs Generally Stop Growing?

Despite the fact that several factors impact growth rate, the majority of dogs stop growing at the age of two. Puppies and early adult dogs undergo several growth changes from birth to around 24 months of age.

Puppies and young adult dogs first require nutrient-rich meals to maintain their developing bodies. After they reach adulthood, they can transition to adult-formulated dog food.

Dog Growth and Size: Do Different Breeds Grow Faster?

While there is a basic growth schedule for dogs, the dog's size will also dictate its growth rate. For instance, Great Danes grow more slowly than Chihuahuas, thus it is vital to consider breed and weight category.

Despite the fact that most dogs attain maturity at two years of age, certain breeds mature sooner.

Having a purebred dog makes it much simpler to estimate your dog's eventual development rate, however mixed-breed dogs are a totally different story. But, as your puppy reaches around 5 to 6 months, you will have a better idea.

For instance, a 2-month-old puppy weighing around 15–16 pounds would likely mature into a huge or giant-sized dog.

1. Toy-Sized Dog Growth Rate (Less than 15 lbs)

Toy dog breeds and dogs in this weight group are the smallest and therefore grow the fastest.

Typically, toy dogs weigh between 2 and 5 ounces after birth, which is equivalent to the weight of half an avocado.

The majority of toy-sized dogs will stop growing between 6 and 8 months of age, and will be completely mature after one year. The smaller a dog is, the faster they attain maturity.

2. Small-Sized Dog Growth Rate (Less than 25 lbs)

Miniature dogs, such as miniature poodles and beagles, do not develop as rapidly as toy-sized dogs, but nevertheless reach adulthood before larger dogs.

At birth, tiny breeds weigh between 6 and 12 ounces. Tiny dogs can attain maturity in as little as 7–12 months, and medium-sized dogs might take as long as 12–16 months.

3. Medium-Sized Dog Growth Rate (Less than 50 lbs)

Several dogs fall into the group of medium-sized weight, which might vary somewhat more with development rates.

Medium-sized dogs typically weigh between 12 ounces and 1 pound at birth and develop at a slower rate than small canines.

They typically attain maturity and cease growing between 16 and 18 months, while some bigger medium-sized canines may take up to two years to reach maturity.

4. Medium-Large Sized Dog Growth Rate (Less than 75 lbs)

Neither medium nor giant, this group includes several popular breeds.

Medium-large dogs typically weigh between 14 ounces and 1 pound at birth, however some larger breeds may weigh up to 2 pounds.

Larger dogs typically require 24 months to reach maturity, compared to 18–20 months for dogs in this weight class.

5. Large-Sized Dog Growth Rate (Less than 100lbs)

Big dogs have the second-slowest growth rate, despite the fact that many popular breeds, such as Labradors, fall into this weight category.

Large-sized dogs typically weigh between 14 ounces and 1 pound when they are born. By the time they reach six months, they will be heavier than a mature medium-sized dog.

Big dogs develop between 18 and 20 months, with near-giant breeds requiring longer.

6. Giant-Sized Dog Growth Rate (Over 95 lbs)

Being the biggest breeds, commonly known as the Giant weight category, these dogs take the longest to attain full maturity.

Giant-sized dogs normally weigh between 14 ounces and 1.35 pounds at birth, however certain breeds may be heavier.

These large dogs often take the longest to develop, typically 20 to 24 months or more.


As listed in "When Do Dogs Stop Growing?" by BestForPets (, some dogs develop at a significantly slower rate than others, despite the fact that puppies are always growing.

There are several reasons why a puppy may continue to grow, particularly if it is a huge or gigantic breed. Although you may not know precisely when your puppy will reach adulthood, there are ways to make educated guesses.

With purebred puppies, it will be easy to determine. As for pups from a shelter or rescue, it will be considerably more difficult to distinguish.

A visit to the veterinarian may help limit down the possibilities and provide clarification.

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