When Do Puppies Stop Growing?
Anywhere from around 10 months to nearly 2 years old, depending almost entirely on adult size — bigger dogs take much longer to finish growing.
Enter your puppy's breed, current weight, and age to estimate their adult weight.
Calculate My Puppy's Adult Weight →Roughly when each size tier finishes
- Toy breeds (under 10 lbs adult) — typically full grown by around 10–11 months.
- Small breeds (10–30 lbs adult) — typically full grown by around 1 year.
- Medium breeds (30–50 lbs adult) — typically full grown by around 14 months.
- Large breeds (50–100 lbs adult) — typically still filling out until around 18 months.
- Giant breeds (over 100 lbs adult) — often still growing until close to 2 years old.
"Stopped growing" isn't always one clean moment
Weight can plateau slightly before height and frame are fully set, and some puppies fill out (gain muscle and chest depth) for a few months after they've technically stopped getting taller. It's normal for a large or giant breed to look "done" around a year old and then keep changing shape for several more months.
What this means for feeding and care
Because giant and large breeds grow for so much longer, controlled growth matters more for them — growing too fast can stress developing joints. This is part of why puppy-formulated food (sized appropriately for large breeds specifically, where relevant) and a consistent feeding schedule matter throughout the whole growth window, not just the first few months. See How Much Should I Feed My Puppy? for feeding guidance by age and size.
Track your puppy's progress
Use the Puppy Weight Calculator to estimate adult weight at any point along the way, or see the full breakdown in the Puppy Growth Chart by Size. For the reasoning behind why growth speed varies this much by size, see How Big Will My Puppy Get?
Height and weight finish at different times
This is the detail that resolves most confusion about when a puppy is "done." Growing happens in two overlapping phases.
Height stops when the growth plates in the long bones close. Weight continues afterward as the chest deepens and muscle develops, a process usually described as filling out. A large-breed dog can be at full height by 12 months and still gain 10 to 15 pounds of frame and muscle over the following year.
So a dog that has not gotten taller in months may still be growing in the way that matters for how it eventually looks.
Growth plate closure by size
| Size tier | Growth plates close | Fully filled out |
|---|---|---|
| Toy | 6–9 months | ~9–12 months |
| Small | 8–12 months | ~12 months |
| Medium | 10–14 months | ~14–18 months |
| Large | 12–18 months | ~18–24 months |
| Giant | 18–24 months | ~2–3 years |
A vet can confirm closure on an X-ray if it matters for a specific decision, such as timing orthopedic surgery or starting competitive sport.
Why this timing matters practically
- Exercise. Repetitive high-impact activity — distance running on hard surfaces, repeated jumping, intensive agility — is best delayed until plates close. Free play and normal walks are fine throughout.
- Food. Puppy formula should continue until growth is complete, which is why large breeds stay on it far longer than small ones. Switching early undercuts a still-growing dog.
- Spay and neuter timing. Early procedures can delay plate closure and produce a slightly taller adult. Current guidance for large breeds often favors waiting, though the decision involves other trade-offs and belongs with your vet.
- Mental maturity lags physical. A dog can look fully adult at 14 months and still behave adolescently for another year, which is especially pronounced in large breeds.
Signs your puppy has finished growing
Height has been stable for several months. Weight has plateaued at a healthy body condition. Body proportions look balanced rather than gangly, with the head no longer appearing outsized. Your vet has stopped adjusting growth expectations at checkups.
If you are unsure, ask at a routine visit. It is a quick assessment and it settles decisions about food, exercise, and neutering at the same time.
Common questions
Do big dogs take longer to stop growing?
Yes, considerably. Toy breeds finish growing in height around 6 to 9 months, while giant breeds continue to 18 to 24 months and keep filling out for up to 3 years. Adult size is the main factor in growth duration.
How do I know if my puppy has stopped growing?
Height stable for several months, weight plateaued at healthy body condition, and balanced adult proportions rather than a gangly look. A vet can confirm growth plate closure on an X-ray if a specific decision depends on it.
Can a dog grow after 1 year?
Frequently, yes. Small breeds are usually done by around a year, but large and giant breeds continue gaining height until 18 to 24 months and keep filling out with muscle and chest depth well beyond that.