Puppy Growth Predictor
Estimate how big your puppy will be as an adult from their age and weight today.
Enter your puppy's details
Not sure? We'll work out the most likely size from your puppy's age and weight.
How big will your puppy get?
Enter your puppy's age and current weight to estimate their adult size.
How to predict your puppy's adult size
Puppies of each size follow a fairly predictable growth curve. A small-breed puppy might already be 40 percent of their adult weight at 12 weeks, while a giant-breed puppy of the same age might be closer to 20 percent. So the calculator looks at how much puppies of your dog's size usually weigh at this age, compared with their adult weight, and works out the adult weight that fits.
For example, a 16-week-old Labrador weighing 26 lb is typically around 38 percent of the way there, which points to an adult weight of about 68 lb.
Puppy growth chart by size
| Age | Small20 lb or less | Medium21 to 50 lb | Large51 to 90 lb | GiantOver 90 lb |
|---|---|---|---|---|
| 8 weeks | 25% | 20% | 15% | 12% |
| 12 weeks | 40% | 32% | 26% | 21% |
| 16 weeks | 54% | 44% | 38% | 31% |
| 6 months | 79% | 69% | 59% | 51% |
| 9 months | 95% | 88% | 82% | 71% |
| 12 months | 100% | 98% | 94% | 84% |
| 18 months | 100% | 100% | 100% | 97% |
Typical values for healthy puppies. Individual dogs vary, and giant breeds vary the most.
When do puppies stop growing?
- Small breeds (20 lb or less as adults): about 9 to 12 months.
- Medium breeds (21 to 50 lb as adults): about 12 months.
- Large breeds (51 to 90 lb as adults): about 12 to 16 months.
- Giant breeds (Over 90 lb as adults): about 18 to 24 months.
Most dogs finish growing taller before they finish filling out, so a little weight and muscle often comes after the growth in height stops.
Other clues to your puppy's adult size
- The parents. If you know them, the parents' weights are one of the best guides, especially the mother's.
- Breed or mix. Breed standards give a typical range. For mixed breeds, a DNA test can reveal the breeds in the mix.
- Paws and skin. Big paws and loose skin are fun to notice, but they are not reliable predictors.
Helping your puppy grow at a healthy pace
Faster is not better. Puppies, especially large and giant breeds, are healthiest when they grow steadily and stay lean. Feed a complete puppy food (a large-breed puppy formula for big dogs), measure meals, and use the feeding guide as a starting point. You should be able to feel your puppy's ribs easily without seeing them.
Planning ahead? See our puppy vaccination schedule and dog age calculator.
Frequently asked questions
How can I tell how big my puppy will get?
The most reliable clues are your puppy's breed or mix, the size of the parents if you know them, and how much your puppy weighs at a given age. Puppies of each size grow along a fairly predictable curve, so comparing today's weight with how much of their adult weight puppies usually reach by that age gives a good estimate. A dog DNA test can also help with mixed breeds.
When do puppies stop growing?
Small breeds usually reach their adult size by about 9 to 12 months, medium breeds by about 12 months, and large breeds by about 12 to 16 months. Giant breeds can keep filling out until 18 to 24 months. Height usually finishes before weight, so many dogs gain a little muscle after they stop getting taller.
Do big paws mean a big dog?
Sometimes, but not reliably. Puppies often have big paws for their body during growth spurts, and paw size varies a lot between breeds. Age, weight, and breed are much better guides.
How accurate is a puppy weight calculator?
Treat it as a good estimate, not a promise. Most puppies end up within about 15 percent of the prediction, and estimates get more accurate as your puppy gets older. Very young puppies, mixed breeds, and dogs at the edge of two sizes are the hardest to predict.
Is my puppy growing too fast or too slow?
Steady growth is healthiest, especially for large and giant breeds, where growing too fast can strain developing joints. You should be able to feel your puppy's ribs easily without seeing them. If your puppy seems very thin, heavy, or is not gaining weight, ask your vet.
How much bigger will my puppy get after 6 months?
It depends on size. At 6 months, small breeds are often about three quarters of their adult weight, medium breeds about two thirds, large breeds a bit over half, and giant breeds around half, so giant puppies can still roughly double their weight.
Sources
- Hawthorne AJ, Booles D, Nugent PA, Gettinby G, Wilkinson J. Body-weight changes during growth in puppies of different breeds. Journal of Nutrition, 2004; 134(8 Suppl): 2027S to 2030S.
- Salt C, Morris PJ, German AJ, Wilson D, Lund EM, Cole TJ, Butterwick RF. Growth standard charts for monitoring bodyweight in dogs of different sizes. PLoS One, 2017; 12(9): e0182064.
- World Small Animal Veterinary Association. Global Nutrition Guidelines and toolkit.
Sources last checked: . How we calculate
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