The Canine Ledger

House Training: A Practical Guide (and Why There's No Study)

Vet and charity advice on house training agrees on the basics, but we found no trial behind it. What they say, and when accidents need a vet.

Written by thecanineledger

If an adult dog that was house-trained starts having accidents, see a vet before you treat it as a training problem. A veterinary behaviourist writing in the Merck Veterinary Manual says that pain, cognitive decline, or “any medical condition that leads to increased volume of urine, more frequent elimination, pain on elimination, or lack of control, must first be excluded”. Blood in the urine, straining, or peeing much more often are reasons to go sooner.

Our note: The signs in the last sentence and the “go sooner” advice are ours.

The Merck Veterinary Manual owner guide says of house training: “With patience and consistency, this usually takes just a few weeks” (Antinoff, Merck Veterinary Manual).

While the advice from vets and charities is consistent, we found no study testing any house-training method. This page sets out what the guidance says, what owners report, and where accidents need a vet.

1. What the guidance agrees on

Go out often. The UK charity PDSA advises: “Take your puppy out every 2-3 hours during the day”, because “your puppy only has a little bladder” (PDSA).

Go out at the right times. The Merck owner guide lists times puppies naturally go: first thing in the morning, last thing at night, after meals, after drinking a lot, after waking from a nap, and after playtime. Very young puppies may also need to go out at night.

Reward it. “Take your puppy outside several times a day at first, and praise it when it goes.”

Don’t punish accidents. PDSA: “Never punish your puppy for having an accident inside the house.”

Our note: None of this advice is tested in a study we could find. It reflects expert consensus.

2. Why punishment backfires

After the fact. The Merck professional guide says “Punishing a dog after finding evidence of house soiling is ineffective because the dog will not associate the punishment with having eliminated in the house previously, and the punishment might thus cause anxiety” (Borns-Weil, Merck Veterinary Manual, professional version).

During the act. “Punishing a dog caught in the act of eliminating in the house is also counterproductive.”

What to do instead. “If the dog is observed while eliminating inappropriately, the owner should use a neutral interrupter (eg, clapping hands or whistling) and then take the dog outside.”

→ Reward-Based or Aversive Training: What the Studies Found

3. How long it takes

Weeks, according to Merck. The owner guide says “usually” a few weeks.

What owners report. In a 2025 UK survey of families, 12.4% of caregivers said toilet training was worse than they expected. 42.3% said it was better or easier (Belshaw et al., PLoS One 2025).

Later on. In a large UK study of young dogs, toileting was reported as an undesirable behaviour for 2.3% of dogs at 6 months and 0.7% at 18 months (Kinsman et al., Animals 2025). Owners wrote in what bothered them, so this isn’t a measure of how many dogs still have accidents.

Our note: We haven’t found a source for when most puppies are reliably house-trained. If progress stalls, ask your vet or a qualified trainer.

4. Older and rescue dogs

It can be done. PDSA says: “Older dogs can also be house trained very easily”. It advises taking them out every hour at first.

Rule out health first. For a dog that was trained and then starts soiling, the Merck behaviourist’s list of medical causes comes first (see the box at the top).

Our note: “Very easily” is PDSA’s phrase. Some rescue dogs take much longer.

→ Puppy Biting and Teething: What’s Normal and When It Ends · → Is It Old Age, or Something Treatable? A Guide to Your Senior Dog · → Before You Bring a Dog Home: The Decisions That Matter Most

5. What we could not verify

Commonly saidWhat we found
“Rub their nose in it”No. Vet guidance says punishment after the fact doesn’t work and may cause anxiety.
“One hour per month of age”No source found for this as a bladder rule. PDSA advises every 2–3 hours in the day.
“It takes a few days”Not in the guidance. Merck says usually a few weeks.
“Accidents in an adult dog are always behaviour”No. Medical causes should be ruled out first.
“Method X is proven”No trial found for any method.

Sources

Always confirm with your vet before acting on anything on this page.