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Puppy guides · 2 min read

Puppy developmental stages

A stage-by-stage map from birth to maturity — what's normal at every age, what to avoid, and exactly when to keep that leash on.

Trainer-written, from the Top Dog SF puppy classes — taught in person since 2004.

Understanding your puppy's developmental stages can greatly influence how they grow into a well-rounded adult dog. Here's a quick guide to the key phases of your puppy's life and how you can support them through each one.

Canine socialization period (3–7 weeks)

This stage usually happens before your puppy joins your home, but it shapes everything that follows. Puppies are learning essential doggy communication — body language, vocalizations, and behaviors — from their littermates and mother. This phase is all about understanding canine interactions and responses.

Puppies should stay with their litter and mom during this time.

The rest of this guide

  • Socialization period (7–12 weeks)
  • Fear impact period (around 8–11 weeks)
  • Seniority classification period (12–16 weeks)
  • Two teething periods
  • Adolescence (~4 months to maturity)
  • Flight instinct period (4–8 months)
  • Maturity
  • The big picture

The full guide — and the step-by-step video exercises it pairs with — is included with Puppy Foundations, our at-home puppy course. A few minutes a day, from first steps to confident manners.

Unlock the full guide with Puppy Foundations →

Already enrolled? Read it in your puppy library →