When Kai was about eight months old, he forgot my name.
Not literally. But the dog who had a rock-solid recall at five months - the one who came tearing back to me every time, no hesitation - would now stand in the yard, look straight at me, and decide the squirrel was the better offer. Sit became a suggestion. Leave it became the opening line of a negotiation. I had done the work. I had months of clean reps to prove it. Then, almost overnight, the work stopped paying out.
If your well-trained dog turned defiant somewhere between six and eighteen months, it almost certainly did not get worse, and you almost certainly did not fail it - it hit adolescence, a real developmental stage where the teenage brain temporarily tunes its owner out. The behavior is normal. It passes. And the thing that carries most dogs through it intact is a steady physical outlet that takes the edge off the new energy, so your training has room to land again.
Let me tell you what is actually happening in there, because once you understand it, riding it out gets a lot more manageable.
This is real, and the science finally caught up
For years, "teenage dog" was something owners said to each other and trainers nodded along to, with nothing solid underneath it. That changed in 2020. A team led by researchers at Newcastle University and the University of Nottingham published the first real evidence that dogs go through an adolescent phase that looks a lot like the human one. They tracked dogs through puberty and found that around eight months of age, the dogs became harder to train and more likely to ignore commands - the same commands they had known cold a few months earlier.
Here is the detail that matters most, and the one almost nobody mentions. The drop in obedience was specific to the owner. In the same tests, the dogs still listened to strangers and to their trainers. They were not broken. They were not suddenly stupid. They were tuning out the one person they were most bonded to, which is exactly what human teenagers do. The researchers also found the dip was a passing phase - both younger and older dogs were more biddable than the teenagers. The bad stretch has an end date.
What is going on under the hood
Two things are happening at once, and they stack badly.
The first is the brain. Adolescence is a full remodel of the canine brain, driven by a flood of hormones, and a remodeled brain does not run its old programs cleanly. Impulse control - the part that says do not chase that, wait for the cue, settle down - is one of the last systems to come fully online. So you get a dog whose body has nearly adult horsepower and whose brakes are still being installed.
The second is energy. Right at the age the brain gets least cooperative, physical drive tends to peak. Some trainers only half-jokingly call the six-to-nine-month stretch the worst of it, because that is when maximum energy meets minimum self-control. You are not imagining that your dog has more gas in the tank than ever and less ability to sit on it. Both are true at the same time, and that combination is what turns a good puppy into a tornado for a few months.
If you want the longer version of why a dog with no outlet for that drive turns into a problem in the house, I wrote about what under-exercised energy does to behavior separately. Adolescence pours gasoline on that exact fire.
The part that takes the blame off you
Most owners hit this phase and quietly conclude they raised a bad dog, or that they did the training wrong. Neither is usually true. The science points the other way: the disobedience is aimed at you specifically because of the bond, not in spite of it. One reading of the research is that the dog is testing whether the relationship still holds - pushing on it the way a teenager pushes on a parent. That is not a character flaw. It is a developmental task.
So the worst thing you can do here is decide the dog is the problem and crack down harder. Adolescents who get met with frustration and heavy corrections do not come out the other side better. They come out more anxious. This is also the age when a lot of fear shows up - dogs in this window can spook at things they were fine with a month ago, and pushing them straight into the scary thing tends to make it worse, not better. Patience is not soft here. It is the strategy.
Why "more exercise" is the right instinct and the wrong execution
When the energy is obviously the problem, the natural move is to run the dog into the ground. More walks. Longer walks. A frantic hour at the dog park. I understand the logic. I tried it. It does not work the way you would hope, and sometimes it backfires.
The reason is that chaotic, high-arousal exercise - the kind that spikes adrenaline - can leave a dog more wound up, not less. You are not draining the tank. You are revving the engine and then wondering why the dog is still vibrating at bedtime. There is a real ceiling on this, and I covered where it is in the piece on whether you can over-exercise a dog. The goal during adolescence is not an exhausted dog. It is a dog whose baseline arousal has dropped, so it can think again.
That is the whole case for structured, steady-state conditioning over scattered activity. A self-paced run at a controlled effort does something a chaotic play session does not: it lowers the resting baseline without firing up the arousal system. The dog comes off it settled instead of cranked. That same controlled outlet is not only an adolescent's friend - it is what carries an older dog through the other hard end of its life, when the problem flips from too much engine to too little. And a settled adolescent is one you can actually train, which is the entire game during these months. If you are staring at a dog with too much engine and no good way to burn it off, the methods in how to tire out a high-energy dog the right way apply double during the teenage window.
What actually gets a dog through it
There is no trick that skips adolescence. You ride it out. But you can ride it out with a manageable dog instead of a feral one, and that comes down to three things: a real physical outlet, calm consistency on the cues you already taught, and management so the dog cannot rehearse the behaviors you do not want.
The outlet is the lever most people miss. A dog that starts the day with its baseline already lowered has more room before it tips over into the chase-everything, hear-nothing state. That is the whole reason a self-powered slatmill fits this phase so well - the dog sets the pace, works at a steady effort, and finishes drained in the good way rather than amped up. If you have never seen what one of those sessions looks like, I walked through what a first session actually involves. It is not punishment and it is not a treadmill sprint. It is a controlled outlet for a body that suddenly has more to give than a neighborhood walk can absorb.
The Florida wrinkle
If you are raising a teenage dog on the Emerald Coast, you have a scheduling problem on top of the developmental one. The months when your adolescent dog most needs to move are the same months the pavement is too hot to walk on and the midday heat is genuinely dangerous. I get into the specifics in the post on why summer walks here are a problem, but the short version is that for a big chunk of the year, the long walks you would lean on to manage an adolescent's energy are off the table for half the day. You need an outlet that does not depend on the sidewalk being survivable, which is exactly the gap a climate-controlled session fills.
The stakes are higher than a few rough months
Here is the part worth sitting with. The researchers who documented all this also flagged something sobering: adolescence is when a lot of dogs get surrendered. The good puppy turns difficult, the owner runs out of patience right at the hardest stretch, and the dog ends up in a shelter - often weeks or months before it would have aged out of the worst of it on its own.
I do not say that to pile on. I say it because if you understand that the behavior is temporary and developmental, you are far less likely to make a permanent decision over a passing phase. The dog you fell for is still in there. It is having the canine equivalent of a fifteen-year-old summer. Give it an outlet, hold the line with kindness, and wait. It comes back.
FAQ
At what age do dogs go through the teenage phase? Roughly six to eighteen months, depending on breed and size, with the most intense stretch often around six to nine months. Smaller dogs tend to mature faster than larger ones. Most owners notice things settling somewhere around twelve to eighteen months.
Why is my dog suddenly ignoring commands it used to know? Because its brain is being remodeled by puberty and impulse control is temporarily offline. Research has shown the drop in obedience during adolescence is aimed specifically at the owner, not at strangers or trainers, so it reflects the bond being tested rather than the training being lost.
Will my dog go back to normal after adolescence? In almost all cases, yes. The studies found the dip in trainability is a passing phase, with dogs becoming more responsive again on the other side of it. The training you put in is not gone - it is buried under hormones for a while.
Should I punish my adolescent dog for acting out? Cracking down harder tends to backfire and can leave the dog more anxious, especially since this is also a common window for new fears. Calm consistency, management, and a real physical outlet get you further than corrections.
Does more exercise fix a teenage dog? A physical outlet helps a lot, but the kind matters. Frantic, high-arousal activity can leave a dog more wound up. Steady, self-paced conditioning lowers the baseline so the dog can settle and focus, which is what you actually need during this phase.
Get the edge off before you train
If you are in the thick of it with an adolescent dog, the move is not a harder correction or a longer leash. It is lowering the baseline so the dog you trained can hear you again. A drained dog is a teachable dog.
That is what we do. Kai's Run brings a self-powered slatmill to your driveway for private, one-on-one conditioning - the dog sets the pace, no other dogs, climate-controlled against the Florida heat. You can start with an intro session on the booking page, or step into the Founding Athlete Program if you want the deeper commitment. We serve Destin, Fort Walton Beach, Niceville, and the rest of the Emerald Coast.
Your dog is not bad. It is a teenager. Help it spend the energy, and wait for the brain to catch up.
- Kai. I put my human through all of this personally. He turned out fine.