Understanding Behaviour Changes of Adolescent Dogs (6 Mths-2 Yrs)

Adolescence is a challenging and fascinating stage in a dog’s life. Between 6 months and 2 years old, dogs undergo significant physical, mental, and emotional changes that affect their behaviour. For many dog owners, this period can feel like a rollercoaster of mood swings, testing boundaries, and new habits. Understanding what drives these changes helps owners support their dogs through this critical phase and build a strong, lasting relationship.

A young adolescent dog sitting attentively in a backyard, showing alertness and curiosity

What Happens During Dog Adolescence

Adolescence in dogs is similar to the teenage years in humans. It is a transitional phase between puppyhood and adulthood. During this time, dogs experience:

• Hormonal changes that influence mood and behaviour

• Physical growth including muscle development and sometimes awkward movements

• Cognitive development where they start thinking more independently

• Social learning as they test their place in the family or pack

  
  

This period usually starts around 6 months of age and can last until the dog is about 2 years old, depending on the breed and individual.

Common Behaviour Changes of Adolescent Dogs

Increased Independence and Testing Limits

Adolescent dogs often challenge rules they once followed without question. They may ignore commands, refuse to come when called, or test boundaries by chewing on furniture or jumping on people. These behaviours are part of their natural drive to explore their environment and assert independence.

Heightened Energy and Playfulness

Many adolescent dogs have bursts of energy that seem endless. They may want to play more aggressively or for longer periods. This can lead to behaviours like mouthing, rough play, or chasing, which can be overwhelming if not managed properly.

Mood Swings and Emotional Sensitivity

Just like human teenagers, adolescent dogs can experience mood swings. They might be affectionate one moment and irritable the next. Some dogs become more anxious or fearful during this stage, reacting strongly to new situations or noises.

Increased Territorial and Protective Behaviour

As dogs mature, they may become more protective of their home and family. This can show up as barking at strangers, growling, or guarding toys and food. While some guarding is normal, excessive behaviour can be a sign of insecurity or lack of socialization.

Changes in Social Interactions

Adolescent dogs often change how they interact with other dogs and people. They might become more dominant or submissive, depending on their personality and experiences. Social skills learned during puppyhood may be tested or forgotten, requiring refresher training.

Why These Changes Occur

Hormonal Influence

Sex hormones like testosterone and estrogen surge during adolescence, affecting behaviour. Intact dogs may show more marking, mounting, or aggression. Spaying or neutering can reduce some behaviours but does not eliminate all adolescent challenges.

Brain Development

The adolescent dog’s brain is still developing, especially the areas responsible for impulse control and decision-making. This means dogs may act impulsively or struggle to focus on commands, making training more difficult but also more important.

Environmental and Social Factors

A dog’s environment and experiences shape how they behave during adolescence. Dogs exposed to positive socialization and consistent training tend to navigate this phase more smoothly. Conversely, dogs with limited social experiences or inconsistent rules may develop problematic behaviours.

How to Support the Behaviour Changes of Adolescent Dogs

Maintain Consistent Training

Consistency is key during adolescence. Keep training sessions regular and clear. Use positive reinforcement to reward good behaviour and avoid harsh punishments that can increase anxiety or aggression.

Provide Good Amounts of Physical Exercise and Mental Stimulation

Adolescent dogs need outlets for their energy. Daily walks, playtime, puzzle toys, and good chews, can help burn off excess energy and keep their minds engaged. A tired dog is less likely to act out.

Set Clear Boundaries

Establish and enforce rules about what is allowed and what is not. For example, decide if jumping on people is acceptable and stick to your decision. Clear boundaries help dogs feel secure and understand expectations.

Socialize Carefully

Continue socializing your dog to new environments, other dogs and people, but be mindful of their comfort level. Controlled, positive interactions build confidence and reduce fear-based behaviours.

Read the previous blogs about Essential Strategies for Training Dogs with Limited Socialization Skills and how to work with your adolescent dog to do this effectively.

Monitor Health and Nutrition

Proper nutrition supports healthy growth and brain development. Regular veterinary check-ups ensure your dog is physically ready for the challenges of adolescence.

Specific Examples of Adolescent Behaviour and Solutions

• Ignoring recall commands: Use high-value treats and practice recall in low-distraction environments before gradually increasing difficulty.

• Chewing furniture: Provide durable chew toys and redirect chewing behaviour. Ensure your dog gets enough exercise to reduce boredom.

• Excessive barking at visitors: Teach a “quiet” command and reward calm behaviour. Use controlled introductions to new people.

• Mounting or marking: Neutering can help reduce these behaviours. Redirect attention and teach alternative behaviours like “sit” or “stay.”

  
  

When to Seek Professional Help

If you are struggling with the behaviour changes of your adolescent dog, and starting to see signs of aggression, extreme anxiety, or behaviours that put anyone's, including their own safety at risk, consult us, at Mutts Den Dog Training, to speak to our professional certified dog trainer or for a recommendation to find a behaviourist.

Early intervention can prevent problems from becoming ingrained.

Adolescence is a time of growth and change for dogs, filled with challenges and opportunities. Understanding the reasons behind behaviour changes helps owners respond with patience and effective strategies. By providing consistent training, exercise, and socialization, you can guide your dog through adolescence and build a strong foundation for adult life.