When Do Puppies Stop Growing?
Most puppies stop growing between 6 and 24 months, depending on their breed and size. Small dogs usually reach full size much sooner than large or giant breeds.
Use the puppy growth calculator below to estimate when your puppy may stop growing, how much growth they still have left, and what stage of development they are currently in.
When Will My Puppy Stop Growing?
Use this puppy growth calculator to estimate when your puppy may reach full size based on their age, weight, and breed or size category.
Tip: Use weeks for puppies under 6 months old
When Do Puppies Stop Growing by Size?
Puppies reach full size at different ages depending on their breed, genetics, and expected adult size. In general, small dogs usually become fully grown much faster than large and giant breeds.
Larger dogs usually take longer to mature because their bones, joints, and muscle structure need more time to fully develop.
Puppy Growth Stages by Dog Size
Puppies move through similar growth stages, but the timing changes depending on their adult size. Small dogs mature much faster than large and giant breeds.
| Dog Size | Early Puppy | Rapid Growth | Adolescent Growth | Near Full Size |
|---|---|---|---|---|
| Small |
0–3 mo Fast early growth, baby teeth, and socialization |
3–6 mo Rapid height growth and high energy levels |
6–8 mo Growth slows while the body fills out |
8–10 mo Final physical changes before full maturity |
| Medium |
0–4 mo Rapid puppy growth and coordination development |
4–8 mo Bones and height develop quickly |
8–12 mo Muscle growth and body filling continue |
12–14 mo Most height growth is complete |
| Large |
0–4 mo Strong early growth and appetite increase |
4–10 mo Rapid skeletal and height development |
10–14 mo Growth slows while muscle continues developing |
14–18 mo Chest widens and the body fills out |
| Giant |
0–5 mo Very rapid bone and body growth |
5–12 mo Fast height growth and heavy calorie needs |
12–18 mo Muscle and structural development continue |
18–24 mo Final body filling and maturity stage |
Breed, genetics, nutrition, and overall health can affect how quickly a puppy moves through each growth stage.
When Do Popular Dog Breeds Stop Growing?
Different dog breeds grow at different speeds. Small breeds usually mature much faster, while large and giant dogs may continue growing long after their first birthday.
Labrador Retriever
Usually fully grown:
15–18 months
Labradors grow quickly during the first year, but muscle development and chest filling may continue well after 12 months.
Golden Retriever
Usually fully grown:
14–18 months
Golden Retrievers continue filling out after most height growth is complete, especially during adolescence.
German Shepherd
Usually fully grown:
15–18 months
German Shepherds experience strong early growth and continue developing muscle and structure into adulthood.
French Bulldog
Usually fully grown:
10–12 months
French Bulldogs mature relatively quickly and usually reach adult size before their first birthday.
Chihuahua
Usually fully grown:
8–10 months
Chihuahuas are one of the fastest-maturing dog breeds and often stop growing within the first year.
Great Dane
Usually fully grown:
18–24 months
Great Danes take much longer to mature and may continue filling out for nearly two years.
Breed genetics, nutrition, and overall health can all influence how quickly a puppy reaches full adult size.
If you also want to estimate your puppy’s future adult size, try our Puppy Weight Calculator , which uses your dog’s current age and weight to predict their adult weight range.
When Is a Dog Considered an Adult?
A dog is generally considered fully grown once they reach full physical maturity, although the exact timing depends on breed and size. Small dogs mature much faster than large and giant breeds.
In many cases, puppies may stop growing in height before they are fully mature mentally or physically. Large breeds often continue developing muscle, chest width, and adult behavior long after their rapid growth phase ends.
Most dogs stop growing in height before they are fully mature physically or behaviorally.
| Dog Size | Usually Considered Adult Around | What to Expect |
|---|---|---|
| Small | 10–12 months | Most small dogs mature quickly and usually behave like adults before their first birthday. |
| Medium | 12–15 months | Medium-sized breeds may continue filling out physically after puppy growth slows down. |
| Large | 15–18 months | Large breeds often take longer to mature both physically and behaviorally. |
| Giant | 18–24 months | Giant breeds mature slowly and may continue developing body structure and adult behavior for nearly two years. |
These growth timelines are based on common veterinary growth patterns observed across different dog sizes and breeds. Large and giant breed puppies may continue developing well beyond their first year.
When Do Puppies Stop Growing? FAQs
Most puppies stop growing between 8 and 18 months depending on their breed and adult size. Small dogs mature much faster, while large and giant breeds may continue growing for nearly two years.
A dog is usually considered fully grown once they reach adult height and weight. Small breeds may be fully grown before 1 year old, while giant breeds can take up to 24 months to fully mature.
Puppies are generally considered adults once they reach physical maturity, although behavior and personality may continue developing afterward. This often happens between 1 and 2 years of age depending on breed size.
Most dogs stop gaining height before they stop filling out physically. Smaller breeds often stop growing in height around 6–8 months, while large breeds may continue until 12–18 months.
Dogs continue growing until they reach full adult size. Depending on breed and genetics, this may last anywhere from 8 months for toy breeds to nearly 2 years for giant dogs.
Small breed dogs usually stop growing between 8 and 10 months. Breeds like Chihuahuas and Pomeranians mature much faster than medium or large dogs.
Large breed dogs often continue growing until 15–18 months of age. Giant breeds such as Great Danes and Mastiffs may keep developing until around 24 months.
Mixed breed dogs may stop growing earlier or later depending on their genetics and expected adult size. In most cases, smaller mixes mature before 1 year, while larger mixed breeds may continue growing for up to 18 months or longer.
Puppies usually grow the fastest during the first 6 months of life. This is when rapid bone development, height growth, and weight gain typically happen.
Yes. Proper nutrition plays a major role in healthy puppy growth and development. Puppies need balanced food, enough calories, and appropriate nutrients to support bone and muscle growth.