Puppy Growth Charts by Breed Size: What's Normal?
How fast puppies grow by size class, and when they finish.
Puppies do not all grow on the same timeline. A Chihuahua is essentially done by its first birthday, while a Great Dane is still filling out well into its second year. Knowing your puppy's size class tells you what a healthy curve looks like, and when to stop expecting more growth.
General estimate, not veterinary advice
This is a general starting estimate, not a substitute for veterinary guidance. Your pet's real needs depend on their health, body condition and individual metabolism. Confirm the amount with your veterinarian.
Growth timelines are breed-size averages for healthy puppies; individual growth varies. Large and giant-breed growth guidance follows standard veterinary and AAHA life-stage recommendations.
Growth timeline by size class
| Size class | Adult weight | Fastest growth | Reaches adult size |
|---|---|---|---|
| Toy | up to 12 lb | 0 to 11 weeks | 9 to 12 months |
| Small | 13 to 25 lb | 0 to 12 weeks | 10 to 12 months |
| Medium | 26 to 50 lb | 0 to 16 weeks | 12 months |
| Large | 51 to 90 lb | 0 to 20 weeks | 15 to 18 months |
| Giant | over 90 lb | 0 to 24 weeks | 18 to 24 months |
Every size shares the same shape: an explosive early phase, then a long taper. The bigger the breed, the longer both phases last, which is why giant breeds carry puppy energy and puppy appetite for so much longer.
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What a healthy curve looks like
Growth should be steady, not spiky. Weigh your puppy on the same scale every couple of weeks and look for a smooth upward line that gradually flattens. Plateaus during teething or minor illnesses are normal. What you want to avoid, especially in large and giant breeds, is growing too fast: rapid gain and excess calcium are linked to developmental orthopedic disease, so large-breed puppy food and correct portions matter.
Estimating adult weight
Breed averages are the best starting point, followed by the size of the parents. A rough shortcut for medium breeds is to double the weight at four months. Whatever number you land on, feed to the growing dog in front of you and confirm against your vet's assessment.
Feed the growth, then track the age
Growing puppies need their portion rechecked as they gain. Use the food portion calculator with the puppy factor, and read the feeding guide for the method. Curious how puppy months map to human years? The dog age calculator uses the same size-adjusted curve, explained in why the Γ7 rule is wrong.
Frequently asked questions
When is a puppy fully grown?
It depends on size. Toy and small breeds finish growing around 9 to 12 months, medium breeds near 12 months, large breeds around 15 to 18 months, and giant breeds not until 18 to 24 months.
How can I estimate my puppy's adult weight?
A common rule of thumb: for medium breeds, adult weight is roughly the puppy's weight at 4 months doubled. Breed averages and the parents' size are better guides. Your vet can assess growth against a breed-appropriate curve.
Should large-breed puppies eat special food?
Yes. Large and giant-breed puppies should eat a diet formulated for large-breed growth. Overfeeding and excess calcium can push them to grow too fast, which is linked to orthopedic problems. Ask your vet.
Keep going with the same pet
Growing puppy? Recheck their portion as they gain weight.
Your cat's age in human years using the real feline curve, not the Γ7 myth.
How much to feed: daily calories and cups by weight, activity and life stage.
Tank gallons and liters from your dimensions: rectangle, cylinder, hex and more.
Bioload-based stocking guidance, not the oversimplified 1-inch-per-gallon rule.