Growth and age
Puppy milestones month by month
A milestones calendar can help you prepare for changes, but development is a range rather than a deadline. This tool dates an approximate early socialization marker, a separate sixteen-week check-in, a broad adult-teeth window and two general full-size references.
What do the early age markers mean?
The approximate fourteen-week socialization marker follows the RSPCA Australia window. The sixteen-week line is a separate age check-in so a familiar age can be located on the calendar. It does not extend or close an official socialization window.
AVSAB emphasizes the first three months and continued positive experiences afterwards. Keep introductions safe and comfortable instead of trying to finish learning by a date.
Sources: AVSAB: Puppy Socialization Position Statement (opens in a new tab)RSPCA Australia: How can I socialise my puppy? (opens in a new tab)
What happens around the teeth window?
RSPCA Australia describes permanent teeth appearing and growing rapidly around four to six months. The calendar displays that as a broad window anchored to the birth date, not a guarantee that every tooth appears on its end date.
A calendar does not examine the mouth. A concern about pain, eating or retained teeth needs individual advice rather than waiting for the next marker.
Sources: RSPCA Australia: What should I feed my puppy? (opens in a new tab)
When does a puppy reach adult size?
PDSA describes many dogs reaching full size around a year, with larger dogs taking longer. RSPCA Australia also notes continued growth in some large and giant breeds to around eighteen to twenty-four months.
The tool shows both broad references without guessing an adult-size group from a birth date. These markers do not clear a puppy for strenuous exercise or predict a final weight.
Sources: RSPCA Australia: How should I exercise my puppy? (opens in a new tab)PDSA: Exercising your puppy (opens in a new tab)
How does the birth-date calculation work?
Weeks are exact seven-day intervals from birth. Calendar-month markers keep the original day where possible and clamp at month end where necessary. The fixed example below illustrates that distinction.
Worked example
Birth
- Approximate 14-week marker
- 16-week check-in
- 4-to-6-month teeth window
- to
- Around 12 months
- 18-to-24-month growth reference
- to
Broad references for planning, not individual development deadlines.
Save, print and calendar export include the five markers or windows. These are planning records, not developmental assessments.
Try it with your own details
Use the Puppy milestones calendar to build your own result.
For general information only, not professional advice. Check the official sources below. Use your own judgement and speak to a qualified professional before you act.
Common questions
More answers on this topic.
Is the sixteen-week line a socialization deadline?
No. It is a separate age check-in; appropriate positive experiences continue.
Does the teeth window guarantee every adult tooth is present?
No. It is a broad development reference, not an examination.
Does the tool guess my puppy's size group?
No. Both broad full-size references are shown without an individual size prediction.
Does a milestone permit strenuous exercise?
No. Exercise readiness needs an individual assessment.
Sources and checked dates
Each note explains what its source supports. Open the link to read the guidance yourself.
Pages 1-2 support early, positive and safe exposure, gentle handling from birth, people, varied stimuli and environments, and avoiding unknown-status dog parks. AVSAB calls the first three months the primary period, not an exact 3-to-14-week rule. It allows suitable puppy classes before full vaccination when its vaccine, worming and hygiene conditions are met. The five-items-per-week layout is PupCalendar's planning format, not an AVSAB schedule.
Describes an approximate 2.5-to-14-week period, calm reward-based experiences, choice, familiar people, sights, low-volume sounds, objects, surfaces and gentle handling. It permits carried observations before full vaccination and cautions about dog contact and public ground. The individual weekly prompts are editorial examples, not prescribed ages.
The Teething section says permanent teeth appear and grow rapidly between four and six months. This supports a broad growth window, not a guarantee that every adult tooth is present on the end date.
States that some large and giant breeds can continue growing until about 18 to 24 months. This is not an individual exercise-clearance date or a separate numeric age for every size group.
The Size section says most dogs are fully grown by one year, while larger breeds can take 18 months to two years. Supports the two broad groups used as broad references; does not supply toy/small/medium/large/giant weight thresholds.