Sami hasn't peed indoors since he was a puppy. He's seven, perfectly house trained, travels constantly, and stays alone in hotel rooms without a second thought. And then one evening in France, we left him in a new Airbnb for five minutes - and came back to a puddle on the bed.

If your Westie just peed on your bed (or someone else's), you're probably asking the same two questions I did: why, and will it happen again. Here's what I learned, starting with the part you should rule out first.

Rule Out Medical Causes First

Before any behavioral theory, and I mean before all of them: sudden indoor peeing in a house-trained adult dog is a medical question until a vet says otherwise. I'm an owner sharing experience, not a vet, but this ordering isn't my opinion - it's what every vet will tell you.

The usual suspects: a urinary tract infection (small frequent accidents, straining, licking afterwards, sometimes blood-tinged urine), crystals or stones (Westies are prone - Sami had struvite crystals as a young dog and at the worst point couldn't pee at all), incontinence (especially in seniors and spayed females - damp spots where the dog sleeps, often without the dog even noticing), diabetes or kidney issues (drinking much more, peeing much more), and in older dogs, cognitive decline that erodes house training itself - more on senior changes in our senior Westie care guide.

Call the vet promptly if: the accidents repeat, your dog strains or seems uncomfortable peeing, drinks noticeably more than usual, dribbles in their sleep, or anything about the urine looks or smells off. A urine test is quick and cheap, and it either catches something early or clears the way to treat the real cause. Only once the body is cleared should you start on the behavior.

The Behavioral Causes

If the vet gives the all-clear, the question becomes what the pee was saying. In a house-trained adult, indoor peeing is almost never spite and almost always one of these:

Stress or panic in an unfamiliar place. This was Sami's story, and I'll break it down below.

Territory marking. Small amounts, vertical surfaces, new smells - a new home, new furniture, another animal's scent. Intact males are the biggest markers (ask me how I know), though neutered dogs and females do it too.

Incomplete house training resurfacing. A dog that was pad-trained or never fully generalized "outside only" can regress under any disruption. If the training foundation is the problem, it's fixable at any age - the method is in our Westie potty training guide.

Overexcitement or submissive peeing, mostly in puppies and young dogs, usually during greetings - a maturity thing more than a training thing.

Why the bed specifically? Because it smells like you. For an anxious dog, mixing their scent with yours on the most you-smelling object in the house is comfort-seeking, not revenge. It only feels personal.

What Actually Happened with Sami

The context: an 11-hour drive from Portugal to Biarritz, arriving tired at an unfamiliar Airbnb. We went up, got the keys, and left Sami in the apartment while we went back down for the bags. Five minutes, maybe less.

The mistake was invisible to us at the time. Sami stays alone in rented rooms all the time - but always after we've moved in. Our bags, our smells, a couple of hours of settling, then we leave for dinner and he naps like a professional. This time he was alone in a completely strange apartment containing zero evidence of us. From his perspective, he'd been driven 2,000 km and abandoned in a random building in a foreign country.

So he panicked, and he did what worried dogs do: he peed on the bed, and again by the living room door frame. Part comfort, part "this territory is at least mine now." We found it, blamed vomit, discovered the truth in the laundry, and felt terrible once we worked out what it must have looked like from his side.

What Fixed It

For us, the fix was embarrassingly simple: never again leave him alone in a new place before it smells like us. Bags in first, dog settled, twenty minutes of him watching us exist in the space - then he can be alone happily for hours. It has not happened again, in that trip's remaining days or in any hotel since.

The general version of the fix is: identify the trigger, then lower the stakes around it. If it's new-place anxiety, arrive properly before leaving them. If it's marking a new home, supervise closely the first weeks and interrupt-and-redirect like puppy training. If it's a stressor at home - new pet, new baby, schedule chaos - work on the stressor, not the symptom. Learning to read your dog's early tension helps enormously here; the tells are subtle in this breed, and I collected them in our stress signals guide.

What doesn't fix it: punishment. A dog who peed from anxiety and gets yelled at becomes a dog with the same anxiety plus a new fear of you. They cannot connect the scolding to a puddle from an hour ago - they just learn that your return is unpredictable, which is precisely the feeling that caused the puddle.

If It Keeps Happening

One decoded accident is a story. Repeats need data. Start a simple log: date, time, location, roughly how much, and what was happening in the hour before - alone or not, visitor, new object, schedule change. A week of notes usually makes the pattern jump out, and it's exactly what both your vet and a trainer will ask for anyway. Small amounts on vertical edges reads as marking; full bladders on soft furniture when alone reads as anxiety; damp sleeping spots read as incontinence and send you straight back to the vet section above.

And while you work on the cause, manage the access: bedroom door closed when you're out, waterproof mattress protector on. Management isn't the fix, but it protects the bed and, more importantly, it stops the spot from re-marking itself while you fix the real problem.

Clean It So It Doesn't Repeat

Dog noses treat old urine as a signpost reading "pee here again." Normal detergent removes the stain and leaves the sign up - to a dog, the spot still smells like a toilet.

Use an enzymatic cleaner, the kind made specifically for pet urine - the enzymes actually break down the odor compounds instead of perfuming over them. Soak the spot generously, let it work as long as the label says, air dry. For a mattress, go in with the enzymatic spray after blotting up what you can, and give it real drying time. Skip ammonia-based cleaners entirely: ammonia smells like urine to a dog and marks the spot as a confirmed bathroom.

We washed the Airbnb duvet twice and reported ourselves to the host, who laughed. Sami received no punishment, because the failure was ours, and he has maintained a spotless record since.

One accident with a clear story is a lesson. A pattern is a message - from the body or the mind - and now you know which order to check them in.

The routines that keep Sami settled through all the travel - and everything else we've learned in seven years - are in the Complete Westie Care Guide.