PuppyweeksPuppy development
Peak Adolescence: what to expect
This is the hardest stretch of adolescence, and it usually overlaps the second fear period — your confident dog may suddenly go wary of familiar things. Same playbook as the 8-week fear period: don’t force, flood, or punish; let them retreat and pair calm exposure with treats. Consistency beats intensity here.
When does this happen?
| Toy · Small | Weeks 25–36 |
|---|---|
| Medium | Weeks 29–44 |
| Large | Weeks 33–52 |
Bigger dogs stay adolescent longer — larger breeds reach each later stage weeks after smaller ones.
Not sure this is your puppy’s exact stage? Check the Puppy Stage Finder. Need a refresher on holding the line through adolescence? See the full training timeline.
Common questions
What is the second fear period in dogs?
A normal developmental wobble — commonly landing somewhere in the 6-to-14-month range, later in slower-maturing breeds — where a confident dog briefly becomes wary of familiar things. Handle it like the first fear period: no forcing, keep distance from what spooked them, reward calm.
Why is my teenage dog scared of things all of a sudden?
Sudden, out-of-nowhere caution toward familiar objects or places during adolescence is usually the second fear period, not a new personality — it’s temporary. Forcing or punishing it can make it stick, so let the dog retreat and pair calm exposure with high-value treats.
Grounded in established canine behavioural science — see our sources.