Teething, Adolescence, Young Dog: Week 12 and the Road Ahead
Twelve weeks together — your puppy is around twenty weeks old, mid-teething and officially no baby anymore. Time for an honest tally and a sober look at what comes next: the adolescent.
Your puppy is now about 20 weeks old
The essentials at a glance
Teething is underway — chewing helps, and stubborn baby teeth belong on the list for the next vet visit. From here on: the habits are built, and adolescence will test them. Hold your standards instead of raising severity, and you'll come through well.
- Teething from about week 14 to month seven: incisors first, canines last. A heightened need to chew is the programme, not a relapse.
- Persistent baby teeth — milk tooth standing, adult tooth beside it — need veterinary checking, typically in small breeds.
- At 20 weeks the four-hour rule of the German welfare ordinance formally ends — the care reality of a young dog barely changes.
- Adolescence from around month six: recall lapses and selective hearing are brain remodelling, not character flaws. Long line instead of escalation.
- Your twelve-week tally may be imperfect — what counts are trust, routines and trend, not the error list.
This article summarises current professional guidance for orientation and does not replace veterinary advice in the individual case. If your dog is unwell, your vet is the right address.
How does teething run — and when does the vet need to look?
Teething starts around week fourteen with the incisors and finishes at six to seven months when the canines have changed — 28 milk teeth are replaced by 42 permanent ones. You'll notice it as an intense need to chew, occasionally bloody toys, picky eating, and sometimes a tiny tooth found in the carpet. Most get swallowed; all of this is normal.
Help is simple: offer suitable chewing material generously now — cooled chews, a wet fridge-cold washcloth, stuffed chew toys. What's busy chewing isn't chewing chair legs; the bite-inhibition principles from week 6 apply unchanged. Very hard objects (antler, bones, stones) stay off-limits — tooth fractures cost more than any chew toy.
One point for the next practice visit's list: persistent milk teeth. If a milk tooth still stands while the permanent one erupts beside it — most often the canines, especially in small breeds — misalignments and tartar niches threaten. Such double teeth are for the vet to judge; often they need extraction, and that is better planned early than late.
What have you achieved in twelve weeks?
More than it feels like from the inside. A dog who trusts you, has arrived in his home, mostly toilets outside, survives a few minutes alone, can walk on a loose leash (sometimes), knows people and dogs, and shoots over at his name like lightning — that is the work of these twelve weeks, and it is the foundation for everything else.
Measure progress by trend, not daily form: house-training accidents rarer than four weeks ago? Alone-time longer? Recall faster? Then the direction is right — outliers included. The perfect twelve-week record exists only in guides that want to sell you something.
And credit your own performance: you carried a living creature through its most vulnerable phase, mostly sleep-deprived and full of self-doubt. For most people the week-1 puppy blues is a memory by now — if not, this is the moment to discuss it with a trainer or vet rather than keep hauling it along.
What comes next? Adolescence — an honest outlook
Between months six and twelve (small breeds earlier, large later) the dog brain remodels: hormones flood in, connections get resorted, and your reliable youngster suddenly hears selectively, forgets the recall and discovers a taste for debate. That is not a defiance phase and not a training failure — it is neurobiology with a run-up.
The strategy is unspectacular: hold standards, strengthen management, avoid escalation. The long line returns before the recall burns three times; training continues in small, winnable sessions; and lapses get a shrug instead of punitive expeditions — the phase passes, the relationship stays. An adolescent course provides structure and the consoling proof that everyone else is living the same thing.
Two admin points for the coming months: around month fifteen, the final shot completes the primary vaccination course — ideally already in the calendar. And the neutering question will pop up eventually: there is no automatism and no universal “right age”; whether and when are case-by-case decisions with your vet practice, calmly and free of regulars'-table pressure.
How does it continue after this guide?
With everyday life — the best dog school there is. The routines of twelve weeks now carry: rest after activity, training in five-minute bites, the weekly grooming routine, the parasite and vaccination calendar. What's new is stamina and depth: longer shared undertakings, first excursions, perhaps a dog sport once growth is complete.
Keep the line to your breeder open: a photo on the first birthday, honest feedback on development — good breeders live on that knowledge, and you keep an experienced contact for breed questions. The littermate group, if one exists, is worth more than its meme ratio suggests.
And if you like: the breed profiles here go deeper on your breed's health and activity needs, the training planner structures the adolescent months, and the age calculator answers the eternal question of how old your dog “really” is in human years. Thank you for walking the first twelve weeks with this guide — the rest of the road you two know better than any manual.
Frequently asked questions
My young dog eats poorly during teething. What helps?
Soaked dry food or temporarily wet food, soft chews and patience — chewing on sore gums simply isn't fun. If reluctance lasts more than a few days or pain signs join in (one-sided chewing, drooling, mouth odour), have the mouth examined at the practice.
Should I collect or count the milk teeth we find?
No — most get swallowed anyway, which is harmless. What matters is checking that no milk teeth remain standing while the permanent ones erupt. A short weekly mouth check (familiar from week 10) and the vet's look at the next appointment are entirely sufficient.
From when may my dog climb stairs and really romp?
Controlled stair climbing is fine now; constant up-and-down and wild jumps remain unwise until growth is complete — around month twelve in small breeds, up to eighteen months in large ones. Exuberant play on grippy ground is allowed and needed; dog sports with jumps and tight turns wait for the finished skeleton.
When should I decide about neutering?
Not now, and not under pressure. Neutering before growth and behavioural maturity are complete has documented downsides and no blanket “for” or “against” — sex, breed, health and your daily life decide the individual case. Have the conversation with your vet when adolescence is actually there, not beforehand on principle.
The guide is ending — how do I know we're on course?
By three unspectacular things: your dog relaxes in your presence, orients to you when unsure, and the daily routines run without constant struggle. Everything else — recall polish, leash perfection, visitor manners — is craftsmanship on that foundation, with the rest of a dog's life to practise.
Sources
- Veterinary dental specialist — persistent deciduous teeth in dogs
- German Dog Welfare Ordinance (TierSchHuV) § 2 — puppy rules up to week 20
- StIKo Vet — small-animal vaccination guideline (completion of the primary course)
Last reviewed on July 27, 2026 by Sufyan Osamah · what that means: Editorial standards
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