Between eight and ten months, you are training a dog that only looks grown up. At eight to ten months a large breed dog looks finished and is not. It has adult height, adult teeth, adult strength and a face that makes strangers ask how old your dog is and then look surprised when you answer. Underneath, the brain is still adolescent and the joints in the biggest breeds are still closing. The gap between how the dog looks and what it can actually handle is the main source of trouble in these two months.
The training theme here is generalization. Your dog knows every behavior in this course. What it does not yet know is that those behaviors apply at the hardware store, in a parking lot full of shopping carts, when a jogger passes, or when another dog appears at twenty feet rather than a hundred. This part is about taking each skill and systematically teaching it in the places where it will actually be needed.
Where your dog is now
Physically, medium breeds are closing their growth plates around now and the largest breeds will take several more months. Stamina is high, recovery is quick, and this is the point at which structured conditioning can begin to replace pure free play: longer walks on varied ground, gentle hill work, swimming if it is available, and controlled retrieving on grass rather than repetitive high-speed turns on hard surfaces. Weight becomes worth watching, because a dog that has stopped growing upward but is still being fed like a growing puppy gains quickly.
Cognitively the dog is capable of real work. It can hold a stay for minutes, learn multi-step behaviors, and discriminate between similar cues. What remains adolescent is impulse regulation under high arousal, and what remains fragile is any behavior that has only ever been practiced in one place. Trainers describe dogs as not generalizing well, and at this age it is obvious: a perfect recall in the yard genuinely tells you very little about the recall in a field with rabbits.
Socially, many dogs become more selective about other dogs, and this is normal maturation rather than a problem to fix. A dog that played with everybody at five months may now prefer two friends and politely ignore the rest. Forcing an adolescent to greet dogs it would rather avoid is how owners create the reactivity they are trying to prevent.
What you have already built
A dog that walks on a loose leash with a working rhythm, checks in voluntarily, turns away from other dogs when asked, stops on cue, drops anything from its mouth, settles on a mat through a doorbell, comes back on a long line, and works happily for food and for the chance to sniff. It also has a body that accepts handling and a history in which nobody has ever hurt it to make a point. That last item is what makes the next stage possible, because the exercises below rely on a dog that wants to be near you.
What you are teaching now
Three things. Recall that has been proofed against progressively harder distractions until it is genuinely trustworthy in a fenced space. A formal heel for short distances, for crowded sidewalks and veterinary waiting rooms. And polite social skill with other dogs, meaning short greetings, clean disengagement, and structured play with rules.
Techniques and games
Recall roulette
Write a list of distractions in order of difficulty for your individual dog: a person walking past, a bouncing ball, a plate of food on the ground, another dog at distance, wildlife. Work through them one at a time on the long line, always starting far enough away that success is likely. Call once. If the dog comes, pay extravagantly, five or six pieces, and then release it back to what it was doing whenever that is safe, because being released is the reward that keeps recall from feeling like the end of everything. If the dog does not come, you were too close; increase distance and rebuild. This is slow, boring, unglamorous work and it is the difference between a dog you can trust and one you cannot.
The name whiplash
Say the name once at random moments in increasingly interesting environments and pay instantly for the head turn. Ten repetitions a day, forever. Attention is the prerequisite for every other cue, and in an adolescent it is the first thing to erode. A dog whose name still produces an instant turn at ten months, in a parking lot, with a squirrel in view, is a dog whose recall will hold.
Heel as a short-distance tool
A formal heel is not a way to walk for an hour; it is a way to cross fifty feet of crowded sidewalk or pass a reactive dog without incident. Teach it with a hand target at your left hip: the dog touches, you take a step, mark and pay in position. Build to five steps, then ten, then a turn. Use a distinct cue and release the dog back to ordinary loose-leash walking as soon as the difficult stretch is over, so that heeling remains something the dog can do rather than something it must endure.
The three-second greeting
When you allow a leash greeting, and it should be rare rather than routine, count three seconds and then cheerfully call your dog away with the recall word and pay. Three seconds is long enough for a polite sniff and short enough that leashes do not tangle and arousal does not climb. Dogs that are allowed to greet indefinitely on leash learn to pull toward every dog they see; dogs that are called away and paid learn that other dogs predict a treat from their owner, which is a much more useful association for a ninety-pound animal.
Tug with rules
Tug is excellent exercise for an adolescent and an excellent way to practice arousal control, provided it has structure. The game starts only on your cue, the dog releases on drop and the game restarts as a consequence, teeth on skin end the session immediately, and you finish before the dog does. Played this way, tug is one of the few outlets that builds impulse control while burning energy, and it works well for the retriever and shepherd types that make up most large breed households.
Reading play, and interrupting it well
Good play is loose, bouncy, full of pauses and role changes, with both dogs taking turns being chased. Trouble looks stiff, silent and one-directional, with one dog repeatedly pinning or body-slamming another. Interrupt every minute or two by calling both dogs away and paying; if play resumes happily, it was fine. This consent test costs nothing and prevents the single bad session that teaches a large adolescent that other dogs are dangerous.
Common mistakes in this stage
- Trusting an off-leash recall because the dog is older, rather than because it has been proofed against that specific distraction.
- Removing food rewards entirely; move to an unpredictable schedule instead, which is more powerful, not less.
- Forcing an increasingly selective dog to socialize with every dog it meets.
- Letting the dog reach the end of the leash before responding, instead of working at a distance where thinking is still possible.
- Ramping up running and fetch too quickly in the largest breeds, whose growth plates are still closing.
- Feeding puppy quantities to a dog that has stopped growing; weigh the dog monthly and adjust.
When to call a professional or a veterinarian
This is a good moment for a joint and weight assessment and for a conversation about when your individual dog can safely start running, hiking or a dog sport. Call about recurrent ear infections, itching, licking of the paws or recurring digestive upset, because allergic disease commonly declares itself between six and twelve months. Call promptly about lameness, stiffness after rest, or a reluctance to use stairs. On the behavior side, ask for help if leash reactivity has appeared or worsened, if your dog has begun guarding space or people, or if play with other dogs regularly ends badly.
Previous: Part 6: Six to Eight Months · Next: Part 8: Ten to Twelve Months · Course index: All ten parts
Keep reading: Dog Care Guide · The Daily Dog Walk · Why Life Is Better with a Pet
Further reading (external): Animal Legal & Historical Center — Table of State Dog Tether Laws — the state limits on how, and for how long, a dog may legally be tethered outdoors.
This course is educational and does not replace individual professional advice. Ask your veterinarian when your particular dog’s growth plates are likely to be closed before increasing running, jumping or sport training.