The adolescent period in dogs - roughly 6-18 months depending on size - involves brain development that affects behavior and is a critical welfare risk period, with many dogs surrendered during this phase.
Dog adolescence is a genuinely challenging developmental period that is often misattributed to stubbornness or bad temperament, leading to inappropriate training responses and shelter surrender. Understanding that adolescent behavior reflects normal brain development helps owners maintain realistic expectations and respond effectively. Dogs that receive patient, consistent training through adolescence emerge as behaviorally stable adults with strong human-animal bonds.