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Development & Milestones

Puppy Adolescence (6–18 Months): Surviving the Teenage Phase

If your angelic puppy turned into a selective-hearing teenager overnight, you are not doing anything wrong. Adolescence is a normal stage — and the way you handle it shapes the adult dog.

Quick Answer

How do you handle a teenage dog?

Lower your criteria, raise your rewards, and manage the environment. Return to easier training settings, use a long line for recall, keep daily routines predictable, and give more mental and physical outlets. Expect setbacks — they are temporary when you stay consistent.

6–18 Mo
Typical Window
Larger Breeds
Last Longer
Temporary
Training “Loss”
Consistency
The Real Fix

5 Changes to Expect in Adolescence

Recall gets worse

The world becomes more interesting than you. A puppy who came every time at 4 months may now pretend not to hear.

Old habits return

Jumping, mouthing, and even house-training slips can resurface as hormones and confidence shift.

Second fear period

Many dogs go through a fear phase between 6 and 14 months and may suddenly react to familiar things.

More energy, less focus

Bigger bodies need more outlets, but attention spans are still short.

Testing boundaries

Adolescents check whether rules still apply. This is learning, not defiance or “dominance.”

The Teenage Training Plan

  • Go back to kindergarten: re-teach core cues like come and stay in quiet places, then rebuild distractions slowly.
  • Use a long line: a 10–15 m line prevents your dog from practicing “ignore and run” while you rebuild recall.
  • Pay more: switch to higher-value food or toy rewards for hard situations.
  • Short, daily sessions: three 5-minute sessions beat one long one.
  • Outlets for energy: sniff walks, enrichment games, and age-appropriate exercise.
  • Protect sleep: adolescents still need lots of rest; overtired dogs are less able to listen.

When It Is More Than a Phase

Sudden aggression, intense fear, or behavior that is getting worse despite consistent training deserves professional help. Start with a vet check to rule out pain, then work with a qualified positive-reinforcement trainer or veterinary behaviorist. Our guides on fear periods and leash reactivity explain common teenage triggers.

Related Guides

First Year Timeline →

Month-by-month milestones.

Stop Jumping on People →

Fix the habit that often returns in adolescence.

Frequently Asked Questions

At what age do puppies become teenagers?

Adolescence usually starts between 6 and 9 months and can last until 18 months, or up to 2 to 3 years in some large and giant breeds.

Why has my puppy stopped listening?

Adolescent brains are reorganizing, distractions become more rewarding, and training that was never proofed in new places starts to break down. Go back a few steps, raise your reward value, and practice in easier settings.

Should I neuter my dog to stop teenage behavior?

Neutering is a medical decision with effects on growth and health that vary by breed and size. Discuss timing with your veterinarian rather than using it as a training fix.

Does the teenage phase end on its own?

The phase ends, but habits rehearsed during it can stay. Dogs whose owners keep training through adolescence mature into far more reliable adults.