Puppy Growth Chart: Weight by Age & Breed Size (2026)
How much should your puppy weigh? Use our puppy growth chart by breed size, see when puppies stop growing, and predict adult weight with simple formulas.
Is your puppy on track? A puppy growth chartshows roughly how much of their adult size they've reached at each age — so you can predict how big they'll get and know when they should stop growing. This guide gives you a growth chart by breed size, the simple formulas to predict adult weight, and feeding tips for healthy growth.
Quick Answer
- • Small breeds reach ~75% of adult weight by 6 months, full size by 8–12 months.
- • Medium breeds reach ~65% by 6 months, full size by ~12 months.
- • Large/giant breeds reach ~50% by 6 months, full size by 12–24 months.
- • Predict adult weight: divide the 6-month weight by the percent reached for the breed size.
Predict your puppy's adult weight
Enter your puppy's current age, weight, and breed size for an instant adult-weight estimate.
Open Puppy Weight PredictorPuppy Growth Chart (% of Adult Weight by Age)
This chart shows the approximate percentage of adult weight a puppy has reached at each age, grouped by breed size. Find your puppy's age and size, then work backwards to estimate their final weight:
| Age | Small | Medium | Large / Giant |
|---|---|---|---|
| 8 weeks | ~20% | ~15% | ~12% |
| 3 months | ~45% | ~35% | ~25% |
| 4 months | ~60% | ~45% | ~35% |
| 6 months | ~75% | ~65% | ~50% |
| 9 months | ~90% | ~80% | ~70% |
| 12 months | 100% | ~95% | ~85% |
| 18 months | 100% | 100% | ~100% |
Percentages are approximate and vary by breed and individual. Accuracy improves with age — a 6-month estimate is far more reliable than an 8-week one.
How to Predict Adult Weight (Simple Formulas)
You don't need a vet to get a solid estimate. Pick the method that matches your puppy's size:
- 🐕 Small / toy breeds: adult weight ≈ weight at 6 weeks × 4 — or double the weight at 4 months.
- 🦮 Medium breeds: adult weight ≈ (weight at 14 weeks ÷ 14) × 52 — or weight at 6 months ÷ 0.65.
- 🐺 Large / giant breeds:adult weight ≈ weight at 6 months ÷ 0.50 (they're only about halfway there at 6 months).
For example, a medium-breed puppy weighing 13 kg at 6 months: 13 ÷ 0.65 ≈ 20 kg as an adult. Prefer to skip the math? The Puppy Weight Predictor does it instantly.
When Do Puppies Stop Growing? (by Size)
| Size | Adult Weight | Fully Grown | Examples |
|---|---|---|---|
| Toy / Small | Under 9 kg (20 lb) | 8–12 months | Chihuahua, Yorkie, Pomeranian, Dachshund |
| Medium | 9–22 kg (20–50 lb) | 12 months | Beagle, Border Collie, Cocker Spaniel |
| Large | 22–41 kg (50–90 lb) | 12–18 months | Labrador, German Shepherd, Golden Retriever |
| Giant | Over 41 kg (90 lb) | 18–24 months | Great Dane, Mastiff, Saint Bernard |
What Affects How Big a Puppy Gets
- • Breed & genetics: by far the biggest factor — parents' size is the best predictor.
- • Sex: males are usually 10–15% heavier than females of the same breed.
- • Nutrition: proper puppy food supports steady growth; over- or under-feeding distorts it.
- • Spay/neuter timing: can slightly affect final height in large breeds — ask your vet.
- • Health: parasites or illness early on can temporarily slow growth.
Don't overfeed large breeds. Pushing a large or giant puppy to grow faster than its natural rate raises the risk of joint and bone problems. Aim for lean, steady growth — your vet can confirm the right portions.
The Bottom Line
Use the chart to see where your puppy sits, then divide their current weight by the percent reached for their size to estimate the adult weight. Remember that small dogs finish early (8–12 months) while giant breeds keep growing up to two years. For an instant, personalised estimate, try the Puppy Weight Predictor. 🐾
Frequently Asked Questions
How can I predict my puppy's adult weight?
A reliable rule is to use the 'percent of adult weight' a puppy has reached at a given age. Small breeds reach about 75% of adult weight by 6 months, medium breeds about 65%, and large/giant breeds about 50%. So for a medium puppy, divide its 6-month weight by 0.65. For small breeds, doubling the weight at 4 months is also a good estimate. Our Puppy Weight Predictor does this automatically.
When do puppies stop growing?
It depends on size. Small and toy breeds finish growing at 8-12 months. Medium breeds reach full size around 12 months. Large breeds keep growing until 12-18 months, and giant breeds (like Great Danes and Mastiffs) aren't fully grown until 18-24 months. Bones finish lengthening first; muscle and chest 'filling out' can continue a few more months.
How accurate is a puppy growth chart?
Growth charts are estimates accurate to within about 10-15% for purebred dogs. Mixed breeds vary more. Accuracy improves with age — a prediction made at 6 months is far more reliable than one at 8 weeks, because most of the variation in final size shows up early.
My puppy is a mixed breed — how do I estimate adult size?
Use the parents' sizes if known: most dogs land between their parents' adult weights. If the parents are unknown, weigh your puppy at 16 weeks (4 months) and use the size-category percentages in the chart above. Paw size relative to leg length is also a rough clue — oversized paws often signal more growing to come. A DNA test can confirm the breed mix and predicted weight range.
Is my puppy overweight or underweight?
Run a quick body-condition check: you should be able to feel (but not see) the ribs, and your puppy should have a visible 'waist' when viewed from above. Puppies that are far above the chart for their age and breed may be overfeeding, which can harm joint development in large breeds. Ask your vet to confirm and adjust portions.
Should I feed my large-breed puppy differently?
Yes. Large and giant breed puppies should eat a food formulated for large-breed growth, which controls calcium and calories to prevent growing too fast. Overfeeding a large-breed puppy can cause joint and bone problems later. Steady, moderate growth is healthier than rapid growth.