How the plan works
Puppies grow fastest in their first few months, then slow down as they approach adult size. Smaller dogs finish growing much sooner than big ones. The plan uses your puppy's breed to estimate their adult weight range and size, then follows a growth curve for that size to show a typical weight band for each week.
Daily energy uses a standard starting point for growing puppies — about three times their resting energy needs until 4 months, then about twice — and milestones such as vaccinations and the socialisation window are placed at the ages they usually happen.
How fast puppies grow, by size
Typical share of adult weight at each age. Individual puppies vary.
| Size | 8 weeks | 12 weeks | 16 weeks | 6 months | Fully grown |
|---|---|---|---|---|---|
| ToyChihuahua, Yorkshire Terrier | 33% | 45% | 55% | 72% | ~9 months |
| SmallJack Russell, Cavalier | 29% | 41% | 50% | 68% | ~10 months |
| MediumCocker Spaniel, Border Collie | 24% | 34% | 43% | 59% | ~12 months |
| LargeLabrador, German Shepherd | 21% | 29% | 37% | 53% | ~16 months |
| GiantGreat Dane, Newfoundland | 16% | 23% | 29% | 43% | ~22 months |
The first months, at a glance
- 8–12 weeks: settling in, first vet check and vaccinations, toilet training, and gentle, positive socialisation every day.
- 12–16 weeks: the socialisation window closes, first walks once your vet agrees, and teething begins.
- 4–6 months: adult teeth arrive, energy needs per kilo fall, and it's time to talk to your vet about neutering.
- 6 months on: adolescence — the time to stay patient and consistent with training.
More detail in bringing home a puppy and the dog food calculator.
Puppy growth questions
How much should my puppy weigh?
It depends mostly on their adult size. Small breeds reach about half their adult weight by around 4 months, while large breeds take about 6 months and giants longer. The plan shows a typical range for each week, but body condition — being able to feel the ribs easily with a visible waist — matters more than any number.
How many times a day should I feed a puppy?
As a guide, four small meals a day until about 12 weeks, three until around 6 months, then two. Toy breeds may need meals a little more often to keep their blood sugar steady.
When can my puppy go for walks?
Your vet will tell you when it's safe after their vaccinations, often a week or two after the second dose. Before then, carry them out to see the world — it's an important part of socialisation.
When do puppies stop growing?
Small breeds are usually fully grown by about 9–10 months, medium breeds by about a year, large breeds by 15–18 months and giant breeds can keep filling out until about 2 years.
Is the weight in the plan a target?
No. It's a rough guide built from a size-based growth curve so you can spot a puppy who is far off track. Never underfeed or overfeed to hit a number — ask your vet to check body condition at each visit.
General guidance, not veterinary advice. Your vet knows your puppy and sets their care schedule.