Large Breed Puppy Care: Early Progress Is Not Maturity — Surviving the Adolescent Phase

"Early progress is not maturity." This final principle from Before You Say Yes to the Dog is one of the most important for owners of large breed puppies, and it addresses one of the most common causes of failed adoptions during the adolescent phase. The book warns that the rapid progress a puppy makes in the first few months of training is not an indication of maturity. It is an indication of the puppy's plasticity during the early developmental period. When the puppy enters adolescence, that plasticity decreases, hormones surge, and the progress the family thought was permanent can temporarily disappear.

The timeline is predictable. During the first three to five months, the puppy is highly receptive to training. He learns quickly, he is motivated by food and attention, and his natural drives are relatively mild because his body is still developing. The family may feel that they have a remarkably well-trained puppy. He sits on command, he walks on a loose lead, he comes when called, and he is generally well-behaved. The family relaxes. They start giving the puppy more freedom, assuming the training is solid. They reduce the management, assuming the puppy has "got it." They may even start reducing the training sessions, feeling the work is mostly done.

Then adolescence hits. For large breeds, this typically begins between six and twelve months of age, depending on the breed. The puppy's body changes rapidly. His testosterone or oestrogen levels surge. His brain undergoes significant remodelling that temporarily reduces his ability to regulate impulses and focus. The puppy who was calm and responsive becomes distracted, impulsive, and sometimes seemingly deaf to commands he previously followed without issue. He may start testing boundaries he had previously respected. He may become reactive towards other dogs. He may forget his house training. He may become more independent and less interested in pleasing his owners.

This is normal. It is not a training failure. It is not a sign that the family did something wrong. It is a developmental phase that every large breed puppy goes through, and it is the phase that catches the most families off guard. The family that mistook early progress for maturity feels betrayed. They thought the training was done. They thought the dog was reliable. Now the dog seems to have regressed, and the family does not understand why or what to do about it.

The book's preparation for this phase is straightforward. Expect it. Do not be surprised by it. Do not interpret it as a sign of failure. And do not reduce the management or training during it. In fact, the opposite is needed. The adolescent phase requires more management, not less. The puppy's access to the house may need to be reduced temporarily. The training sessions may need to become more frequent and more structured. The exercise may need to increase to accommodate the puppy's growing energy levels. The family's consistency must be maintained or even tightened, because the patterns established in the early months are being tested by the adolescent brain, and they will only survive if they are reinforced.

Families who understand this phase and maintain their systems through it emerge with an adult dog whose early training resurfaces as the adolescent phase ends. The patterns were always there. They were just temporarily masked by the hormonal and neurological changes of adolescence. When those changes settle, the well-trained puppy re-emerges, and the family's investment in early training pays off.

Families who do not understand this phase are the families who rehome adolescent dogs. They see the regression as a permanent failure. They blame the dog. They blame the training method. They blame themselves. And they give up, surrendering a dog who was actually progressing normally and would have recovered from the adolescent phase with a few more months of consistent management.

If you are raising a large breed puppy, mark the adolescent phase on your calendar. Expect the regression. Maintain the system. Do not give the puppy more freedom during this phase; give him more structure. The early progress was real, but it was not maturity. Maturity comes later, and it comes to the families who persist through the difficult months in between. Your puppy will grow up. Your job is to keep the system strong until he does.

German Shepherds are among the most intelligent and trainable of all dog breeds, but this intelligence is a double-edged sword. A German Shepherd who is not given adequate mental stimulation will find his own entertainment, and his choices are unlikely to align with the family's preferences. This breed needs not just physical exercise but also cognitive challenges. Training sessions, puzzle toys, scent work, learning new commands, and structured play that requires problem-solving all contribute to the mental stimulation a German Shepherd requires. Families who provide this stimulation have German Shepherds who are calm, focused, and well-adjusted. Families who do not often find themselves dealing with destructive, hyperactive, or reactive dogs whose considerable intelligence is being channelled into unwanted behaviours.