House-training a dog
Why a dog wees indoors
A dog who goes indoors is neither dirty nor spiteful: he is answering a need from his body, in the only place he believes he is allowed to use. With a puppy, the cause is usually simple: nobody has shown him where to go yet, and his bladder is still small. With an adult who has already had time to learn, it usually comes down to three things, sometimes combined. He may simply never have properly learnt where to go. He may also be anxious: urine marking usually comes from dogs seeking reassurance by leaving their scent, not from “dominant” dogs. You can spot it by the small squirts on a vertical surface (a furniture leg, a wall), quite different from a real wee, which empties the whole bladder onto the floor. Or he has built up a habit around a spot: if he always wees in the same place, he has filed it under “toilet” and he keeps going back. If you adopt a dog whose past you do not know, assume he has everything to learn in your home and run through the method from the start, without waiting for any sign of a setback.
This reflex applies to a dog whose habits you already know: if a dog who has been clean until now suddenly starts weeing indoors, especially at night or in large amounts (real puddles, not a few drops), it is not necessarily a setback. Cystitis (an inflammation of the bladder, which makes him wee often and can be painful), kidneys or hormones going out of balance (he drinks and wees a lot), or incontinence in a spayed female all produce exactly this picture. Book an appointment to rule out a medical cause before any retraining. And if the vet finds nothing, so much the better: you simply pick the routine back up, tightening up the outings as you did at the beginning.
How long he can hold it, by age
A puppy cannot hold on for long. During the day, awake and active, he needs to go out very often, every one to two hours: his capacity is short, roughly one hour per month of age (two hours at two months, four hours at four months). At night, while he sleeps, he holds on longer, roughly his age in months plus one hour. Most puppies gain full bladder control between four and six months, a little later in small breeds, whose bladders are smaller. In a healthy adult, that limit stretches out to around six to eight hours during the day, but there is nothing to stop you going out more often: the more chances he gets to succeed outside, the faster house-training settles in.
The method to house-train him
Before you start, gather what you need to make every success easy to celebrate.
0 / 3Puppy or adult, the logic is the same: head off the accident by going out often, keep an eye on him indoors, and reward him in the right place until the habit sticks.
Take him out on a tight schedule, especially at the start
A young puppy who is awake needs an outing every one to two hours (see above for how long he can hold it at his age); an adult holds on longer but still goes out very often in the early days. Also take him out systematically when he wakes up, within thirty minutes of a meal, after play and before bed. Keep that tight rhythm for as long as accidents are frequent; once he strings together several days without one, you can space the outings out little by little.
Stay outside until he goes, and celebrate the moment he does
Once outside, give him time: allow five to ten quiet minutes, without rushing him or playing before he has been. The instant he finishes, say your marker word in a cheerful voice (“yes!”) then immediately give him a treat he genuinely loves (not an ordinary piece of kibble), small, pea-sized, and praise him with real enthusiasm. If nothing comes after ten minutes, go back in keeping an eye on him (or a few minutes in his pen) and go out again a little later: the urge always comes back.
Keep to the same routes outside
A familiar route is reassuring, and walking gets the gut moving: a relaxed dog on ground he knows lets go more easily than one standing still in the garden. If he hesitates to go out at night or somewhere he barely knows, stay calm and give him his five to ten minutes rather than pushing.
If he goes indoors in front of you, interrupt him gently
Do not throw a “no” at him: fear stops him in the moment, but it does not teach him where to go. Just make a small neutral sound to interrupt him (a light clap, a cheerful “out we go!”), enough for him to lift his head, without frightening him. Do not grab him or lift him up mid-flow: call him or draw him towards the door, and go outside with him. If he finishes outside, celebrate exactly as usual, marker word and treat.
Keep a steady routine
Meals at fixed times make his needs predictable. Even once the tight rhythm of the first few weeks is behind you, aim for at least three full outings a day, wee and poo, morning, midday and evening.
On waking
- First thing in the morning and after every nap
- The body has had a pause, the bladder is full: straight out, before your coffee
After a meal
- Within the next 30 minutes
- Eating triggers the urge to go: this is an outing that succeeds almost every time
After play or excitement
- Excitement speeds everything up
- You go out before it overflows, you do not wait for the signs
Before bed
- One last outing, wee and poo
- For a peaceful night, for him and for you
Everyone in the house follows the same rules, otherwise your dog gets lost: nobody scolds him for an accident, everyone takes him out on the same rhythm and celebrates the same way when he succeeds outside. Agree on a single marker word (“yes!” for example) and all stick to it, from the first day to the last.
The mistakes that slow house-training down
Clean the smell properly, or he will go back to the same spot
His nose picks up urine long after yours has stopped smelling anything. As long as an area “smells of wee” to him, it stays an invitation to do it again. Dealing with the smell is therefore part of the training.
What really lifts the smell
What makes it worse or just hides it
The best air freshener is still not creating the puddle: a routine of outings and a reward in the right place.
When to see a vet
New house soiling in an adult deserves a medical opinion first. Some signs call for a vet's opinion even if you do not yet know your dog's habits (a recent adoption): here they are, from the least to the most urgent.
Worth noting and watching closely
- He asks to go out at night when he never used to: note since when, it will help the vet
Book an appointment with your vet
- A dog you know well, who was house-trained, suddenly starts weeing indoors again
- He drinks and wees far more than before, and it is not going away
- He wees often in small amounts, with cloudy or bloody urine
- Leaks during sleep in a spayed female
- AVSAB — Position Statement on Humane Dog Training (2021)
- Herron, Shofer & Reisner — Confrontational and non-confrontational training methods, outcomes (2009)
- House Soiling in Dogs, Merck Veterinary Manual (2024)
- Cleaning pet urine stains and odours, ASPCA
- Polyuria-polydipsia and chronic kidney disease in dogs, International Renal Interest Society (IRIS)
- Guidelines for the diagnosis and management of urinary tract infections in dogs, ISCAID (2019)
Going further
Frequently asked questions
How do you house-train an adult dog?
The same method as for a puppy: take him out very often, keep an eye on him indoors, and celebrate the wee outside with a marker word and a treat. Never punish an accident. And if this dog was already house-trained before, have your vet rule out a medical cause first.
Why does my adult dog wee indoors?
It is neither revenge nor “dominance”: most often it is incomplete learning, insecurity (he marks to reassure himself) or a room he has filed under “toilet”. A sudden change in a house-trained dog calls first for ruling out a medical cause (cystitis, kidneys, hormones).
How do you house-train a dog?
In two stages: prevent, then reward. You multiply the outings at the right moments, you keep an eye on your dog indoors, you keep to the same routes outside, and you mark the wee outside with an enthusiastic “yes!” followed by a reward. You clean accidents with an enzymatic cleaner to break down the smell, and you stay patient: punishment only slows the learning down.
Why is my dog weeing in the house?
Three training explanations: marking out of insecurity, incomplete learning, or a spot that has become “his toilet”. But a medical cause gives the same picture: cystitis, a dog drinking and weeing a lot, or leaks at rest in a spayed female. If it is new, see your vet. A male straining to wee without managing to is an emergency.
How long does it take to house-train a dog?
There is no universal timeline: it depends on age, size and how consistent you are. Count in weeks of steady routine rather than in exact days, especially for an adopted adult starting from scratch in your home. Every accident you scold sets progress back: better to prevent and to celebrate the wins.
How long can a puppy hold his wee?
During the day, count roughly one hour per month of age (two hours at two months, four hours at four months), but when he is awake and active, take him out far more often, every one to two hours. At night, while he sleeps, he holds on longer, roughly his age in months plus one hour. Most puppies gain full bladder control between four and six months, a little later in small breeds.
Are puppy pads or absorbent mats a good idea for an adult dog?
For a healthy dog, no: it is the same trap as with a puppy. The pad teaches him to go indoors, always in the same place, instead of learning to hold on and go outside. You are setting up a habit that will then have to be undone, which drags the retraining out. The only real exception is medical: an elderly, ill, post-operative or incontinent dog who physically can no longer hold on or get downstairs. There, the pad is a matter of care, not a training choice. For everyone else, put your money on regular outings and the reward outside.
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