When Ziggy, a Border Collie puppy from Clovelly, hit fourteen weeks, his owners called Luke Buchanan convinced something had gone wrong. The confident, biddable puppy from a month earlier had turned wary of the vacuum, the postman, and his own lead. Nothing had gone wrong. Ziggy had hit a completely normal developmental stage that catches most first-time owners off guard, because nobody had told them it was coming.

Luke Buchanan, Owner of The Toe Beans Co and Sydney's Puppy Trainer, sees this pattern constantly: owners panicking at a stage that's entirely normal, or missing a window that mattered because they didn't know it was time-limited. Knowing roughly what's coming each month changes how you respond to it.

8 to 12 weeks: the critical socialisation window opens

This is the stage most puppies come home, and it's the single most important window for exposure to new people, dogs, sounds, surfaces, and experiences. Everything introduced calmly and positively now builds a puppy's baseline confidence for life. The 5 Golden Rules should already be running in the household from the very first day, not introduced later once habits have formed. Exercise stays minimal, short lead walks only, roughly five minutes per month of age, twice a day.

3 to 4 months: the first fear period

Somewhere in this window, many puppies go through a fear period: things that didn't bother them a few weeks earlier suddenly do. This is developmental, not a training failure. The response matters more than the trigger. Stay neutral, don't over-comfort, don't force exposure. A calm, unbothered response from the owner teaches the puppy the trigger wasn't actually a threat. Teething also lands here, which is often behind a spike in mouthing that isn't a discipline problem so much as a physical one.

4 to 6 months: adolescence begins

Commands that were reliable at three months can suddenly look shaky. This is normal, not regression in the sense of undoing progress, it's a genuine developmental shift as independence increases. This is exactly the stage where consistency across every household member matters most, because a puppy testing boundaries during adolescence will find and exploit any gap between what different people allow.

5 months: the socialisation window closes

By around this point, the critical socialisation period most trainers work from has closed. Whatever exposure has happened by now forms the baseline a dog carries into adulthood. This doesn't mean socialisation stops mattering, it means the window for shaping baseline confidence and comfort with new experiences is now mostly behind you rather than ahead.

6 to 12 months: full adolescence

Exercise tolerance increases, but the joint-growth ceiling still applies, particularly for larger breeds, so duration should keep building gradually rather than jumping straight to adult levels. This is also when a second, less dramatic fear period sometimes shows up. The same rule applies: neutral, unbothered response, no forcing, no over-comforting.

12 months and beyond: settling into adulthood

Most dogs are physically closer to adult by twelve months, though larger breeds can keep developing skeletally for several months more. Behaviourally, a dog that had a consistent foundation through the earlier stages usually settles noticeably here, the testing of adolescence gives way to a calmer, more predictable adult temperament.

What to actually do at each stage, not just expect

Knowing a stage is coming only helps if it changes what you do. In the foundation phase, the task is exposure and the Golden Rules, not obedience polish. Through the fear periods, the task is restraint, resist the urge to comfort or force. Through adolescence, the task is consistency, holding every rule exactly as written even as the puppy tests every one of them. None of these call for a different method. They call for applying the same method at the moment it actually matters.

The thread through every stage

None of these stages are managed by a different approach. The same foundation, calm and consistent leadership, household-wide agreement on the rules, and a realistic read of the dog's arousal level, carries through every month. What changes is what you're likely to see and when, not the underlying method.

Want a clearer map through your puppy's first year?

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Frequently asked questions

Q: My puppy suddenly seems scared of things that never bothered them before. Is this normal?

Very likely a fear period, most common around three to four months. Stay neutral, don't force exposure or over-comfort, and it typically passes within a few weeks.

Q: Why did my puppy's obedience get worse around five months?

Adolescence. It's a genuine developmental shift, not a sign training has failed. Consistency across the household matters more here than at any earlier stage.

Q: Is it too late to socialise my puppy if we're already past five months?

The critical window is closing fast. By the time your puppy is 6 months they should have had ideally 100 different experiences: people, places, things and dogs