The Toe Beans Co dog training Sydney
Luke Buchanan 5 min read

23. Puppy Development 8-20 Weeks: What To Expect

Your puppy doesn't develop in one smooth line from eight weeks to twenty. It moves through distinct stages, each with a different capacity to learn and a different tolerance for stress. But knowing which stage your puppy is in changes what's worth focusing on this week, and pushing the wrong approach at the wrong stage is how small problems turn into bigger ones later.

8-10 weeks: settling in and reading stress signals

Your puppy has just left its litter and everything around it is new. Negative experiences land harder here than they will later, so the aim isn't to shield your puppy from the world, it's to introduce that world carefully. Watch for stress signals: yawning when there's no reason to be tired, cowering, a tucked tail, whale eye (that sideways glance that shows the white of the eye). See any of them and create distance rather than pushing on.

puppy learning to settle at home, The Toe Beans Co dog training Sydney

This is also when the toilet routine starts properly: out on waking, after eating, after playing, roughly every 45 to 60 minutes at this age. When it comes to mouthing, redirect to a toy every time. Never put your hand in your puppy's mouth to test or correct it. At eight weeks that's not a behaviour problem, it's a puppy being a puppy.

Exercise stays short too, about five minutes of on-lead walking per month of age, twice a day, so an eight to ten-week-old puppy gets somewhere around five to ten minutes a session. Most of your socialisation has to come from calm, controlled encounters close to home rather than distance covered on the lead.

10-12 weeks: the fastest learning your puppy will ever do

This is peak learning capacity. Your puppy is food-motivated, curious, and taking in patterns fast, but the attention span still runs out after three to five minutes. Several short sessions across the day beat one long one every time.

Keep building variety into socialisation: different people, different surfaces, other dogs matched by size and temperament rather than age (a twelve-week-old German Shepherd can already outweigh a six-month-old Dachshund). If something spooks your puppy, stay neutral. Don't soothe. Turn away from whatever caused the reaction and offer affection once your puppy has settled and the trigger's out of sight. Comforting a startled puppy in the moment rewards the fear rather than helping it pass.

12-16 weeks: the heaviest lifting on socialisation

This is the stretch to front-load exposure. Your puppy is at its most impressionable right now, and you have more control over what it experiences than you will later. The socialisation window itself doesn't close until six months, but this stage is where the effort pays off most, because habits and associations are still soft and easy to shape.

Mouthing shifts slightly here. A calm "ow", then gently push your puppy off and redirect to a toy. Still no punishment, still a redirect.

Watch your puppy on walks too. A tired puppy doesn't slow down first, it stops, sitting down mid-walk or refusing to push forward. Ignore that signal often enough in a large-breed puppy and the joint strain doesn't show up for years, by which point the damage is done.

puppy training outdoors, The Toe Beans Co dog training Sydney

16-20 weeks: behaviour firms up, socialisation keeps going

Something does shift around sixteen weeks. It isn't the thing most people think. Mouthing moves from a developmental stage to a behavioural one: any teeth on skin or clothing now gets an immediate timeout, not a redirect.

Your puppy also has more attention span and more consistency to work with than it did at eight weeks, which makes this the stage for proofing. Your puppy might already sit reliably in the kitchen. Can it sit on a busy footpath? In a park, with another dog nearby? That's a different skill to teaching the behaviour in the first place, and it's what sixteen to twenty weeks is for.

Most advice online treats eight to twenty weeks as one lump stage: socialise, train, done. It isn't, and treating an eight-week-old and a twenty-week-old puppy the same way is a common reason training plans stall around week fourteen.

One correction worth making plainly, because it gets repeated a lot: the socialisation window has not closed by twenty weeks. It closes at six months. There's still real runway left, so keep going rather than treating twenty weeks as a deadline.

Get ongoing support for your puppy journey

Navigating each stage correctly means knowing what's actually happening developmentally, not guessing. That's why we created our free Skool community.

  • Weekly live Q&A sessions with advice specific to your puppy's current age and stage
  • Complete puppy courses that map to each developmental phase with appropriate activities
  • A supportive community of other owners at similar stages who understand what you're dealing with
  • Week-by-week development guides from eight weeks through to six months
  • Updated resources on managing the transition between each developmental phase

Best part? It's completely free. No subscription. No catch. Just dog owners helping dog owners.

Join the free community.

Upcoming Puppy Schools Across Sydney

Luke runs regular puppy schools right across Sydney, from the Lower North Shore through the Eastern Suburbs and out to Campbelltown. Check upcoming dates and book your spot.

Common Questions

What should I focus on teaching my puppy between 8 and 12 weeks?

This is the most important window for socialisation. Focus on positive exposures to sounds, surfaces, people, and other dogs rather than formal commands. A little bit of sit and name recall is fine, but the priority is making the world feel safe. What your puppy learns to accept during this period tends to stick.

Why is 8 to 16 weeks so important for puppy socialisation?

Eight to sixteen weeks is the most intense part of the socialisation window. The brain is primed to form lasting associations during this time, and experiences both good and bad have an outsized effect. The window itself does not close until six months, so keep going right through to twenty four weeks. A puppy who misses out on calm, positive exposure to new things is more likely to be anxious or reactive as an adult.

What is the fear imprint period in puppies?

The first fear imprint period typically falls around 8 to 11 weeks. During this time a single frightening experience can leave a lasting mark. This is why vet visits, grooming, and meeting strangers all benefit from being handled gently and positively right from the start.

What age should a puppy start puppy school?

Start as early as you can. We begin working with puppies from eight weeks, at home, on toileting, biting, sleep and settling.

Group puppy school starts once the second vaccination is done, which is usually somewhere in the twelve to fourteen week range and most commonly at twelve weeks. Classes run for four weeks, one session a week, capped at ten puppies and matched by size.

The socialisation window stays open until 24 weeks, which is the same as six months, so you have a real but limited run at it. Most of the problems that show up at six or twelve months are preventable if you start before they start.

Puppy School runs up to 16 weeks. If your puppy is already older than that, the work moves into Puppy Training instead, and it is still well worth doing.

What does puppy development look like between 16 and 20 weeks?

Between 16 and 20 weeks puppies are usually more confident and curious. The socialisation window does not close until six months, so keep broad, positive exposure going while you start more structured training. Teething peaks around this age, so expect chewing. Mouthing is different. It should already be gone by 16 weeks, and teeth on skin or clothing from here on is a behavioural issue rather than a stage, handled with an immediate timeout.

Which areas of Sydney do you work in?

One to one training happens in your home, anywhere in Sydney within roughly a forty five minute drive of the Harbour Bridge. That covers the:

  • Inner City and City Centre
  • Eastern Suburbs
  • Inner West
  • Lower North Shore
  • Upper North Shore
  • Northern Beaches
  • Hills District
  • Western Sydney
  • South Sydney and St George

Group puppy school runs at six fixed venues within about eight kilometres of the Harbour Bridge: Paddington, Edgecliff, Neutral Bay, Zetland, Alexandria and Marrickville. All six are taking bookings. See the puppy school dates page for current dates.

What is the best way to get in touch?

You can always give us a ring if you have questions or book a complimentary meet and greet by following this link: Book Now

Does your training use pain, fear, force or aggression?

Absolutely not. If you want a method like that I suggest you call the 1980s, go back there and never get a dog.

We teach The 5 Golden Rules, which is built on calm and consistent communication. The aim is a dog who chooses to look to you when something happens, rather than a dog who has been made to. No pain, no fear, no force, ever, and that is not a marketing line. Anything that works through intimidation gets you a quieter dog for a fortnight and a worse problem six months later.

Upcoming Puppy Schools

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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