Your 3-Month-Old Puppy

Somewhere around three months the useful advice inverts. Up to now the instruction has been to keep adding — more surfaces, more sounds, more people, more of the world while it is cheap to absorb. From here the return on adding drops sharply, and the return on repeating rises just as sharply.

That is not a smaller job. A puppy that will sit in your kitchen and not in your hallway has not learned to sit; it has learned a kitchen. Turning what it knows in one place into something it can do in five is most of the work of this month, and it is the part almost everyone skips in favour of teaching something new.

• Practise what the puppy already knows, in more places, rather than teaching more things.
• The primary vaccination series usually finishes during this stage — later than most people expect.
• Chewing is heavy, and heaviest is still ahead. It is a physical need, not a training problem.
• House-training progress is uneven, and going backwards for a few days is normal.
• Alone-time practice gets quietly dropped around now, and that is how it becomes a problem later.

The puppy that arrives at three months is noticeably more able than the one that arrived at twelve weeks: better coordinated, longer attention, better bladder control, more willing to venture away from you. It also looks enough like a small dog that people start expecting it to behave like one.

The gap that matters here is generalisation. A very young animal learns behaviours attached to the place, the posture, the smell and the person that were present when it learned them. It is not withholding a skill it has when the context changes; it genuinely does not yet have the skill in that context. “He knows it, he is just being stubborn” is the most common and most costly misreading of this age, and it usually leads to pressure being applied where practice was needed.

This is the biggest section on the page, because it is the work of the month. Sessions stay short — a few minutes, several times a day, ending while the puppy still wants more. What changes is the place you do it in and the competition you do it against.

The useful mental model is a bank. Every repetition that goes well is a deposit, and behaviour holds up under pressure later in proportion to what was banked now. Nothing on this list is reliable at three months, none of it should be tested where it matters, and treating any of it as finished is how it comes apart at seven months.

• Generalise deliberately. Take one known behaviour and run it in five places this week: kitchen, hallway, garden, doorstep, front path. Expect it to fall apart in each new one and to rebuild in a few repetitions. That is the process working, not failing.
• Add distraction in rungs, not leaps. Someone walking past inside the house, then a person at a distance outdoors, then a person nearer. If the puppy cannot take food, the rung is too high — go back one.
• Recall stays a game and never a command. Run away, let the puppy chase, pay it extravagantly every time. Never call to end something enjoyable, never call when you cannot make it happen, and never call twice.
• Lead work moves outdoors, briefly. Reward the position you want rather than correcting the one you do not. Two minutes of good practice on the drive beats twenty minutes of pulling on a walk.
• Settle on a mat, on cue, while life goes on around it. Of everything here this is the one that pays most during adolescence, and it is easiest to build now.
• Keep alone-time on the calendar. It is the first thing to lapse once a routine feels settled, and separation problems are far cheaper to prevent than to treat.
• Handling continues as cooperation rather than restraint: a paw offered and given back, a brief look in an ear, ending before the puppy wants it to.

Lead work and recall, built properly

Most puppies are noticeably drier by three months, and most owners respond by relaxing the schedule — at which point the accidents come back and it feels like a regression. Usually it is not: it is the routine being withdrawn before the habit was finished.

Extend rather than stop. Lengthen the intervals gradually, keep going outside with the puppy so you can still reward what you actually saw, and keep the reward outdoors and immediate. Supervision matters more than instruction at this stage; a puppy loose in an unwatched room is being set up to fail.

Accidents remain information rather than misbehaviour. A cluster of them usually points at a change — a longer stretch alone, a new room, a stretch of bad weather, or an interval that grew too fast. Punishment teaches a puppy to go where you are not looking, which is a worse problem than the one you started with. A sudden and genuine loss of house-training, especially with straining or frequency, is a veterinary question rather than a training one.

The primary socialisation period the American Veterinary Society of Animal Behavior describes runs through the first three months, so this stage sits at its far edge. That does not mean socialisation stops. It means the cheap part is over: new things still register, they simply need more repetitions and more care to land well.

So the emphasis moves from variety to depth. A puppy that has met a bus once has met a bus; a puppy that has watched buses from a bench on six calm occasions has an opinion about buses. Repetition at a distance the puppy can handle is what turns exposure into confidence, and it is worth far more now than another novel category.

The quality rule holds and matters more, not less. One calm experience where the puppy chose to approach and could have left is worth more than an afternoon of being carried through a crowd. Where you can safely go still depends on where your puppy is in its vaccination series and on the disease picture where you live, which remains a conversation with your veterinarian rather than a rule this page can give you.

What to expose a puppy to, and how to read the puppy

Chewing is substantial at this age and the part driven by teething has not started yet. Merck puts the appearance of the permanent teeth at around four to five months, with the full set in by about seven, so what is ahead of you is more of this rather than less. No amount of instruction will train it away — a household that treats it as disobedience will spend the next few months losing an argument.

The work is management rather than correction. Keep a rotation of things that are legal to chew so they stay interesting, put the illegal options out of reach rather than relying on supervision, and use cold — a wet flannel frozen into a twist, or a stuffed toy from the freezer — because it helps a sore mouth in a way nothing else on the list does.

Two things are worth separating. Chewing is normal; swallowing is the risk. The most likely serious accident of the next few months is an object going down rather than being chewed, so what the puppy chews should be too large to swallow and should be checked as it wears down. On hardness, ask your veterinarian directly: chews that do not give at all are a recognised cause of fractured teeth, and “natural” is not a synonym for safe.

Mouthing you should now be firmly on its way out. Teeth on skin ends the fun for a moment — hands still, attention off, no drama — then a legal chew appears. Consistency across everyone in the house matters more than what any one person does.

The mouth you are looking after for the next decade

Most puppies are on three meals a day through this period. How much is a question for your veterinarian rather than a chart — it changes quickly, it depends on the food, and it is one of the more useful things to ask at an appointment where the puppy is being weighed anyway.

The useful idea at this stage is that meals are training currency. A portion of the daily food, delivered by hand during two-minute sessions or scattered for the puppy to find, does more work than the same food in a bowl — it buys repetitions, it slows eating down, and it costs nothing extra.

It is too early for adult food. Growth finishes much later in a large dog than a small one, and moving early is a genuine risk rather than a saving; ask when, rather than deciding when.

What the label does and does not tell you

Nights are usually consolidated by now, or close to it. Daytime sleep is the part that quietly erodes: the puppy is more interesting to be around, more able to join in, and gets offered more to do — and an overtired three-month-old looks like a rude one rather than a frantic one.

Keep enforced rest in the day, and treat the late-afternoon collapse into biting and grabbing as the sleep signal it almost always is. Settling is also a trainable behaviour rather than only a state, which is what makes the mat work in the training section worth the effort.

Using a crate for rest rather than containment

Outings can grow a little, and the shape matters more than the length. A walk where the puppy sets the pace and stops to sniff does more for it than one where it is kept moving, and sniffing tires a young dog far more reliably than distance.

The constraint remains repetition rather than movement. Growth plates are open, and it is repetitive forced exercise — running alongside a bicycle, long stair sessions, throwing a ball until the puppy stops — that is worth avoiding. Free movement at the puppy's own pace is a different thing and is good for it.

Most of the tiring is still mental. Five minutes of training, a scattered handful of kibble, or a new surface to investigate will empty a three-month-old more thoroughly than an extra kilometre.

There is more coat than there was a month ago and, for some, the beginning of a change in it. Keep the sessions brief and cooperative: brush for a minute, hold a paw as though clipping and give it back, look in an ear, stop early. What you are training is a dog that finds handling unremarkable, not a groomed puppy.

If a professional groomer is in this dog's future, keep the visits going as introductions rather than waiting until the coat requires one. The appointment that goes badly is almost always the first one that was needed rather than chosen.

There is usually at least one appointment in this stage, and for many puppies it is the one that completes the primary vaccination series. Take the record and everything added since, because what happens next depends on what has actually been given rather than on what a schedule says should have been.

It is a good appointment for the unglamorous questions too: weight and growth, what the puppy should be eating and how much, when parasite prevention starts or changes, and whether there is anything in the mouth worth keeping an eye on before the permanent teeth arrive.

Choosing a practice before you need one

By three months most puppies have crossed the age or weight thresholds that products carry, and the conversation moves from “when can we start” to “what is the plan for this year”. Ask for it in that form: what, from when, until when, and what to do if a dose is missed.

The answer is local. Heartworm prevention is seasonal in most of Canada and its start date follows the mosquito season where you live rather than the calendar; tick activity runs longer at both ends of the year than most people assume. A puppy that will hike, swim, visit a cottage or spend time in long grass has a different plan from one that will not.

Region and season, and what actually drives the timing

The hazards move up and outwards at this age. A three-month-old can reach surfaces it could not last month, is confident enough to try things it would previously have avoided, and is putting more in its mouth than at any other point so far.

• Swallowed objects, which remain the most likely serious accident of this period. Socks, stones, corn cobs, string and the stuffing out of a toy are the usual culprits.
• Counters, coffee tables and anything left at nose height, which is now higher than it was.
• The front door and the car door. Confidence arrives before road sense does.
• Car travel with the puppy secured rather than loose.
• Stairs and jumping down from furniture, which a bolder puppy now does without being lifted.
• Long grass, standing water and wildlife faeces on outings, which is a parasite question as much as a safety one.

The two things that close out this period are the end of the vaccination series and a puppy that is visibly less puppy-shaped. The first changes where you can go; the second changes what people expect of the dog, usually faster than the dog changes.

Adolescence is the thing worth knowing is coming. It arrives around six or seven months and it is not a training failure — a dog that appears to forget what it knew is doing something developmentally ordinary. The reinforcement banked in this month is what it comes back to on the other side, which is the argument for doing the unglamorous repetition now rather than teaching something new.