Canine adolescence between 6-18 months is the developmental period when most dogs are relinquished to shelters, driven by predictable behavioral changes owners are unprepared for.
Dog adolescence creates a welfare crisis driven by the gap between owner expectations and developmental reality. Owners who achieved reliable training with their puppy experience adolescent regression as betrayal or willful disobedience, leading to frustration, punitive responses, and ultimately relinquishment. The neurological basis for adolescent behavioral change — documented in multiple species including humans — reframes the experience from a training failure to a normal developmental phase requiring patient, consistent management. Dogs relinquished during adolescence face shelter stress and often euthanasia for what would have been temporary behavioral challenges. Owner education about adolescent development is one of the highest-leverage welfare interventions available.