The most demoralising phase of dog ownership arrives without warning around eight or nine months. The puppy that had a reliable recall at six months now looks straight at you and carries on. The dog that had not chewed anything since February destroys a skirting board. Owners conclude the training failed, or that the dog is being deliberately difficult.
Neither is true. Adolescence in dogs is a genuine developmental stage with hormonal and neurological changes behind it, and it is the period during which more dogs are handed to shelters than any other.
What is actually happening
Several things at once. Sex hormones arrive and change motivation and interest in the wider world. The brain is reorganising, and the parts involved in impulse control are still catching up. Fear responses can resurface: a second fear period is commonly described in this window, where a dog suddenly becomes wary of things it accepted happily at five months.
Adult teeth have settled but chewing remains a normal outlet, and the dog's physical capacity has increased enormously while its judgement has not. A dog that could not reach the worktop in May can reach it in September.
It is temporary. Most dogs are recognisable again somewhere between fifteen and twenty-four months, later in large breeds. What you do during the phase decides how much of the earlier training survives it.
Destruction, and what it usually means
Chewing furniture, skirting boards and shoes. Almost always an outlet problem: a dog with energy, curiosity and nothing legitimate to do. The answer is management plus alternatives, not correction.
Damage concentrated at doors and windows. This is different and worth taking seriously. It is escape behaviour, associated with distress rather than boredom, and it needs the separation protocol rather than a new chew toy.
Shredding paper, emptying bins, stealing laundry. Frequently attention-driven, and frequently rewarded by the chase that follows. A dog that has learned that stealing a sock produces a household-wide game will keep doing it.
Digging in a garden or a plant pot. Normal canine behaviour. It needs somewhere acceptable to happen rather than a ban.
The plan that works
Manage the environment
For a few months, do not leave the dog with access to things it can destroy. Baby gates, one dog-proofed room, shoes away, cables secured, bins behind a door. This is not giving up on training, it is stopping the dog rehearsing a habit while the training catches up.
Increase the mental side, not just the walks
Adolescent dogs are rarely tired by distance alone, and more running frequently produces a fitter dog with the same restlessness. Feed meals from puzzle feeders and by scattering, add sniffing time on walks, teach new behaviours in five-minute sessions, and provide long-lasting chews in the afternoon slump.
Go back to the long line
When recall falls apart, stop calling a dog that will not come. Every ignored cue weakens it. Use a five to ten metre line on a harness for a few weeks, pay every return generously, and rebuild. Arguing with an adolescent brain across fifty metres of park is a fight you lose.
Keep the rules identical
This is where households fail. Jumping up is either allowed or it is not, and the answer cannot depend on who is holding the lead or whether the dog is wet. Inconsistency during adolescence teaches persistence extremely efficiently.
Pay the good behaviour you stopped noticing
Most owners of adolescent dogs spend the whole day reacting to what goes wrong and never mark the twenty minutes the dog spent lying quietly. Reward the calm, deliberately, several times a day.
What not to do
- Punishing after the event. A dog cannot connect your reaction to something it did forty minutes ago. The guilty look is a response to your posture, not an admission
- Escalating equipment. A harsher collar because recall has failed adds discomfort to a developmental phase
- Assuming neutering will fix it. It does not treat fear, and for many of these behaviours it changes nothing
- Long absences. This is the worst possible age for eleven hours alone, and it is when most of the damage happens
- Giving up on training. The dog is not learning nothing in these months, it is learning whatever it practises
The second fear period
If your adolescent suddenly reacts badly to something ordinary, a bin, a man with an umbrella, the lift, do not force it closer and do not reassure in an anxious voice. Increase the distance, pair the thing with food at a range where the dog is comfortable, and let it approach in its own time. Handled calmly, these episodes usually pass. Handled by dragging the dog up to the object, they can become lasting fears.
Living with it in a flat
In an apartment the stakes are higher, because the damage is to a rented property and the noise reaches neighbours. Three things carry most of the load: a genuinely good walk before you leave, a broken absence in the middle of the day, and a dog-proofed space rather than the run of the flat.
A midday walk during this phase is not an indulgence. It removes the hours in which the destruction and the barking happen, and it gives a dog that is physically an adult and mentally thirteen something to do with the middle of its day.
Keep perspective. The dog chewing your skirting board at eleven months is not the dog you will have at three years, provided the next six months are managed rather than fought.
General information for dog owners in Luxembourg, not veterinary or legal advice. For your own dog, ask your vet, a qualified behaviourist or your commune. How this journal is written and checked.
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