Is It Incontinence or Something Else? Ruling Out Infection, Stones and Behaviour

True incontinence means urine escaping without your dog meaning it to, and usually without her even knowing. The classic picture is a passive leak while she's relaxed, lying down or fast asleep, leaving a wet patch she didn't feel happen and a dog who's a bit puzzled by the damp bed (UC Davis Veterinary Medicine; MSD Veterinary Manual). She squats and wees perfectly normally the rest of the time. That pattern, dry and continent when she's up and about, leaking when she's resting, is the signature of urethral sphincter mechanism incompetence, USMI, the weak bladder-neck muscle covered in my spayed dog is leaking urine.

Compare that with a dog who is consciously passing urine in the wrong place: cocking a leg against the sofa, squatting on the carpet while wide awake, or producing small dabs on upright surfaces. Vets call that periuria, and it's a different animal entirely. It might be a house-training gap, marking, excitement or submissive weeing, or a sign she suddenly can't hold on (Today's Veterinary Practice). The volume and the posture are the tell: a relaxed leak is passive and she's unaware; a deliberate wee involves her getting into position and emptying out.

So before anything else, watch her for a few days and note three things: when it happens (asleep and resting, or up and active), whether she seems aware of it, and whether the urine is a puddle she's lain in or a deliberate squat or cock of the leg. That little log does more to sort this out than almost any test, and it's exactly what your vet will ask. Our dog incontinence management and medication chart download has a simple leak diary you can use, and how to describe urinary signs to your vet walks through what's worth noting.

Even when it does look like a passive leak, a handful of medical problems can copy it or pile on top of it. This is the bit your vet rules out before reaching for the incontinence tablets, because if one of these is at play, the tablets alone won't fix it.

A urine infection. A bladder infection irritates the bladder lining and can make a dog wee small amounts, urgently, often with a bit of blood, and sometimes have accidents she can't help. Here's the nuance that catches people out, though: in a dog with USMI, an infection is more often a consequence of the leaking than its cause. A bladder that doesn't empty crisply, and a weak sphincter that lets bacteria creep up, together make infection more likely (Today's Veterinary Practice). In one small study of bitches with a congenital weak sphincter, every one of the six that had a urine culture grew bacteria (Acta Veterinaria Scandinavica). Either way, an infection can make the leaking worse, so it's checked and treated, but treating it usually settles the flare without curing an underlying sphincter weakness. (The whole "is it a UTI?" question, and why it's a different story in cats, is in "is it a UTI?".)

Bladder stones. Stones scratch and irritate, so they tend to cause straining, frequent small wees and blood rather than a silent resting leak. Occasionally a stone or other blockage stops the bladder emptying, it overfills, and urine dribbles out under pressure, which can masquerade as incontinence. So stones are on the list, especially if there's straining or blood alongside the leaking. The type of stone then decides the plan, which is the whole point of bladder stones in cats and dogs.

Drinking, and weeing, far more than usual. This one matters, and it's easy to miss. If your dog is suddenly drinking a lot more and producing far more urine, a perfectly normal bladder can simply be overwhelmed, especially overnight, and leak (MSD Veterinary Manual). But the real question then isn't the bladder, it's why is she drinking so much. Excessive thirst and urination in a dog points at conditions higher up or further afield, kidney disease, diabetes or Cushing's disease among them, and those need their own work-up. This is the bladder-is-not-the-kidney line we draw throughout this space: if the leaking comes with obvious extra thirst, weight change or an off dog, that's a flag to look past the bladder. Our bladder or kidneys? article covers when urinary signs are really pointing somewhere else.

There's one mimic that's really about age. If the dog leaking urine is young, a puppy or a dog under a year, and especially a young bitch who has dribbled more or less constantly since you got her, the cause is more likely to be a plumbing fault she was born with: an ectopic ureter (Merck Veterinary Manual; American College of Veterinary Surgeons).

The ureters are the two tubes carrying urine from the kidneys down to the bladder. Normally they empty into the bladder, where a working sphincter holds it in. With an ectopic ureter, one or both tubes bypass that storage system and open further down, past the bladder neck or even into the vagina, so urine trickles out continuously with no way to hold it (ACVS). The give-away is a young dog who dribbles steadily, awake or asleep, often with a damp, sore patch of skin from the constant wet, rather than the occasional resting puddle of USMI (Today's Veterinary Practice).

It's largely a young female's problem, females are affected many times more often than males, and several breeds carry a higher risk, including the Labrador and Golden Retriever, the Siberian Husky, the Newfoundland and the West Highland White Terrier (Merck Veterinary Manual). It's frequently mistaken at first for a puppy who's just slow to house-train, which delays getting it looked at. The reason it matters to name it here is that the fix is completely different: a weak sphincter responds to a daily medicine, but an ectopic ureter usually needs a procedure to reroute or seal off the misplaced tube, and your vet will want to find it rather than treat for the wrong thing. So if your leaking dog is young and has always dribbled, say so, it changes the plan.

It does happen that an otherwise-healthy dog wees indoors for reasons that aren't about the bladder at all: incomplete house-training, marking, the puddle of excitement when you walk in, or the submissive crouch-and-wee when she's told off or feels cornered (Today's Veterinary Practice; VCA). In an older dog, a sudden change in toileting can occasionally tie in with canine cognitive decline. These are real, and they're solvable, but they're handled with training, management and patience, not a sphincter tablet.

Here is the order that matters, and it's the same rule we apply to a cat weeing outside the litter tray: rule out the medical causes first, always (this is the spine of weeing in the house and the principle behind our whole start-here funnel). An adult dog who was reliably clean and has started having accidents deserves a vet check and a urine test before anyone calls it "naughty" or "spite", because she may have an infection, a stone, a sphincter that's weakening, or be drinking more because something else is brewing. Telling her off for something her body is doing isn't just unfair, it can make a frightened, submissive wetter far worse. Get the body checked, and then, if everything comes back clear, the behavioural angle is the right place to look.

You don't have to crack this at home, and the work-up is usually quick and low-drama. Armed with the history you've gathered, your vet will:

• Examine her, often watching her wee if they can, and feeling the bladder and the area around it.
• Test a urine sample. This is the workhorse. A urinalysis screens for infection, blood and crystals, and a culture, the lab test that actually grows any bacteria, settles whether there's a genuine infection to treat (Today's Veterinary Practice). A fresh sample from you makes this far easier, and our urine sample collection how-to download shows you how.
• Run bloodwork if she's drinking more, to check the kidneys and look for diabetes or other systemic causes of all that extra urine.
• Scan her with ultrasound to look at the bladder, check it's emptying properly, and hunt for stones or an obvious abnormality (Today's Veterinary Practice).
• Go a step further when it's needed, with a detailed ultrasound, contrast imaging, or a camera passed into the bladder (cystoscopy) if a young dog might have an ectopic ureter. Cystoscopy is the most reliable way to confirm one, though a careful ultrasound now picks up many of them too (Today's Veterinary Practice; Veterinary Radiology & Ultrasound).

For the great majority of middle-aged spayed bitches with a classic resting leak and a clear urine test, that's as far as it goes: the picture fits USMI, and the next step is treatment rather than more tests (UC Davis Veterinary Medicine). The point of the work-up isn't to put your dog through a battery of investigations, it's to make sure the simple, treatable answer really is the right one before you start the medicine.

And that's the reassuring shape of all this. Most of the time the leak is exactly what it looked like, a treatable weakness of the bladder-neck muscle that responds well to a once-daily tablet in the large majority of dogs (the standard medicine controls the leaking in around 85 to 90% of spayed bitches in studies) (UC Davis Veterinary Medicine; Today's Veterinary Practice). The other causes are worth excluding precisely because they're fixable too, just in a different way. So gather a few days of notes on when and how she leaks, book a visit with a urine sample, and let the test, not the guesswork, point you to the right next step. If it is USMI, treating incontinence: the medicines that work is where you go next; if she's young and has always dribbled, flag the ectopic-ureter possibility; and either way, living with a leaky dog has the day-to-day kit to keep her comfortable and dry-bedded while you sort it.