Bringing home a new puppy is pure joy—but also a whirlwind of questions. One of the most common ones new dog parents ask is: When do dogs stop growing? Whether you’re watching a tiny ball of fluff turn into a lanky adolescent or trying to pick the right crate size, understanding your dog’s growth timeline is crucial.
In this guide, we’ll explain when dogs typically stop growing, how breed size impacts development, and how to ensure your dog grows into a strong, healthy adult. Let’s dive right in with the quick answer you’re probably looking for.
When Do Dogs Stop Growing?
Most dogs stop growing between 6 to 24 months, depending on their breed size. Small breeds like Chihuahuas may reach full size by 6–8 months, while giant breeds such as Great Danes may continue growing until 18–24 months.
Here’s a quick table summarizing it:
| Breed Size | Growth Stops Around |
| Small Breeds | 6 – 9 months |
| Medium Breeds | 10 – 12 months |
| Large Breeds | 12 – 18 months |
| Giant Breeds | 18 – 24 months |
Now, let’s take a deeper look at what affects this timeline and how you can support your dog’s development.
Factors That Affect a Dog’s Growth Rate
Several key factors determine how fast or slow your dog matures physically:
1. Breed & Genetics
The biggest predictor is your dog’s breed. Small breeds like Yorkies and Pomeranians grow rapidly and mature fast. Giant breeds, on the other hand, require more time due to their massive bone and muscle structure.
Even within breeds, genetics play a role. Two Labradors from the same litter might grow at slightly different rates.
2. Nutrition
What your pup eats impacts everything—from immune health to bone development. Puppies need a diet rich in protein, calcium, DHA, and vitamins tailored to their breed size. Overfeeding large breed pups can even trigger joint issues like hip dysplasia.
Want to make sure you’re feeding your pup right? Check out our Dog Nutrition Plans designed for every stage of growth.
3. Neutering/Spaying
Studies suggest that early neutering may slightly delay the closure of growth plates, potentially making dogs grow taller than average. However, the overall size impact is usually minimal.
4. Health Conditions
Medical issues like malnutrition, hormonal imbalances (like hypothyroidism), or parasitic infections can stunt or delay growth. That’s why regular checkups are vital. You can schedule one through our Veterinary Consultations page.
How to Tell if Your Dog Has Stopped Growing
You might wonder if your dog is still growing or has reached their full size. Here are signs your dog might be done:
- Stable weight and height for a few months
- No noticeable changes in paw or head size
- Babyish features (like floppy ears) start looking more defined
- Your vet confirms bone growth plates are closed (via X-ray)
Pro Tip: Keep track of your pup’s height and weight every month using a simple chart. Growth plateaus are a great clue that your dog is nearing maturity.
What Happens After a Dog Stops Growing?
Even after dogs stop growing physically, they continue to develop mentally and emotionally. Training, socialization, and exercise are just as important now as during their puppy months.
Here’s what to expect:
- Muscle Filling: Dogs often bulk up even after height growth ends, especially in active breeds.
- Behavioral Maturity: Many dogs still act “puppyish” until they’re 2–3 years old.
- Health Monitoring: Adult dogs require different nutrition and exercise plans. Our Puppy Growth Monitoring services help you transition your pup smoothly into adulthood.
Growth Milestones by Breed Size
Let’s break down what typical growth looks like for each size category:
Small Breeds (e.g., Pugs, Dachshunds)
- Full adult size by 6–9 months
- Teething ends around 6 months
- High energy and fast metabolism
Medium Breeds (e.g., Beagles, Border Collies)
- Growth slows by 10–12 months
- Personality starts to settle
- Final weight and muscle mass appear post 1 year
Large Breeds (e.g., Labs, Golden Retrievers)
- Grow rapidly till 8 months, then slow down
- Reach full size by 15–18 months
- May act like a “teenager” until 2 years
Giant Breeds (e.g., Mastiffs, Saint Bernards)
- Slowest to mature
- Growth continues up to 2 years
- Need extra joint support and careful feeding
Common Myths About Dog Growth
Let’s clear up a few popular misconceptions:
- Myth: Bigger paws mean the dog will grow huge.
Reality: Paw size is a rough indicator but not definitive. - Myth: Dogs stop growing when they hit puberty.
Reality: Puberty and full physical growth are separate milestones. - Myth: All dogs mature at 1 year.
Reality: Only small breeds may finish growth by then.
When Do Dogs Stop Growing?
To recap, dogs stop growing between 6 to 24 months, depending mainly on their breed size. While small dogs grow up quickly, giant breeds take their time. Pay close attention to your pup’s breed, diet, health, and behavior as they mature.
Knowing the growth stages helps you provide the right care—nutrition, vet visits, and environment—to support your dog’s lifelong health.
Still unsure if your dog has stopped growing? Book a session with our Veterinary Consultations team and get professional insights.
Takeaway:
Growth is more than just size—it’s about health, habits, and happiness. Whether your puppy is racing toward adulthood or taking their time, enjoy every stage. 💛
