Puppy first year schedule
A puppy’s first twelve months compress more medical, behavioural and physical change than any other stage of a dog’s life. This guide lays out the whole year in order — vaccinations, worming, socialisation, neutering conversations and growth checks — so nothing falls through the gap between a busy new-owner schedule and a vet visit six months away.
Last updated 2026-07-19
| Stage | Timing | What happens |
|---|---|---|
| 6–8 weeks | Before rehoming, usually by the breeder | First vaccination and first deworming, plus a general health check and weighing. |
| 10–12 weeks | ~2–4 weeks after dose one | Second vaccination; many practices allow supervised outdoor exposure a week or so after this dose — confirm your vet’s local advice. |
| 14–16 weeks | ~2–4 weeks after dose two | Third vaccination, often including rabies where required; full outdoor access typically begins here. |
| 12–16 weeks | Socialisation window | The period behaviourists consider most sensitive for positive exposure to people, sounds, surfaces and other animals. |
| 2–12 weeks old | Every 2 weeks | Worming continues on a fortnightly rhythm while the puppy is still very young. |
| 3–6 months old | Monthly | Worming moves to a monthly interval; flea and tick prevention usually starts once the puppy meets a product’s minimum age and weight. |
| 6–12 months | Vet-guided | Spay/neuter timing conversation, adult booster planning, and a mid-year weight and growth check. |
| 12 months | Once | First annual health check and the switch onto an adult booster and prevention schedule. |
Why this order matters
A puppy’s immune system, body weight and behaviour all change fast enough that a single fixed date does not work the way it does for an adult dog. Vaccine doses are spaced to work with (not against) maternal antibodies that fade unpredictably in the first weeks of life, worming intervals shorten because young puppies carry a much higher parasite burden, and the socialisation window closes around 12–16 weeks regardless of vaccination status — so vets increasingly recommend careful, supervised exposure before the course finishes rather than waiting for full immunity. Recording exact dates in the first year matters more than in any later year because so many of these events are sequential: one step’s timing depends on the one before it.
What happens if you miss a step
A missed puppy vaccination dose does not always mean starting the whole course again, but it can extend the gap before full protection and change the next appointment date — only your vet can say which for the specific vaccine used. A missed worming date in a young puppy is lower-stakes but still worth catching up promptly, since puppies can carry a heavier worm burden than adults. Write down the actual date something happened, not the week you think it happened; puppy schedules move fast enough that memory alone is unreliable within a month.
When to ask your vet
This guide sequences the commonly used milestones for a healthy puppy in a low-risk environment; it is not a substitute for your veterinarian’s specific protocol, which will vary by vaccine brand, breed, local disease prevalence and the puppy’s own health. Toy breeds, giant breeds, rescue puppies with unknown history, and puppies showing any illness should follow their vet’s individual plan instead of this general timeline. Seek prompt veterinary advice for vomiting, diarrhoea, lethargy, reduced appetite or any sudden behaviour change.
How to keep the record useful
The most useful way to use a first-year timeline is to log each event the day it happens rather than trying to reconstruct it later from memory or a paper vaccination card that can go missing.
Because so many puppy milestones depend on the date of the one before it, a record that calculates the next due date automatically removes the mental math of "second dose was three weeks ago, so third dose is around…" — which matters most in exactly the busy, sleep-deprived first months of puppy ownership when it is easiest to lose track.
Frequently asked questions
Can I start the puppy vaccination series later than 6–8 weeks?
Yes, many puppies begin later depending on when they were rehomed or their individual health; your vet will adjust the whole sequence around the actual start date rather than the age given here.
Is the 12–16 week socialisation window really that strict?
Behaviourists treat it as a sensitive period rather than a hard cutoff — exposure after it is still valuable, but is generally considered less effective at shaping lifelong temperament.
When should I ask about neutering?
Timing varies significantly by breed size and individual health, and recommendations have shifted in recent years, particularly for larger breeds — this is a conversation to have with your vet around the 6-month mark rather than a fixed date to follow.