TL:DR

• Urinary incontinence is more common in desexed female dogs than in male dogs.
• The most common cause is urethral sphincter mechanism incompetence, but not every leaking dog has the same diagnosis.
• A proper diagnostic work-up should come before long-term treatment.
• Many cases are manageable once the cause is identified.
• If your dog is leaking urine, straining, or leaving puddles, it is worth seeing a vet.

What is urinary incontinence?

If your dog is leaving wet patches on the bed, dribbling urine while asleep, or leaking without seeming to notice, that can be frustrating, messy, and worrying. The good news is that urinary incontinence in dogs is often manageable once the cause is identified.

Urinary incontinence means a dog is leaking urine involuntarily. It is different from poor toilet training, behavioural marking, or urinating more often because of another illness. In true incontinence, the dog is not choosing to pass urine. It simply leaks.

This is seen much more commonly in desexed female dogs, but it can also happen in males. When it happens in a male dog, especially a younger one, it is usually worth investigating more carefully before assuming the cause is straightforward.

What causes urinary incontinence?

There are several possible causes, but one of the most common is urethral sphincter mechanism incompetence, often shortened to USMI. This means the muscular “seal” that keeps urine inside the bladder and urethra is not closing firmly enough. Think of it like a tap that does not shut completely. Most of the time it holds, but under the wrong conditions, a slow leak occurs.

USMI is especially common in desexed female dogs. In male dogs, it is less common, so other causes may need to be considered more seriously.

Other possible causes include:

• congenital abnormalities such as ectopic ureters
• spinal or nerve disease affecting bladder control
• urinary tract infection
• bladder inflammation
• partial urinary obstruction with overflow leakage
• prostate disease in males
• anatomical abnormalities of the bladder or urethra

The pattern matters. A dog that leaks while relaxed or asleep, but otherwise urinates normally, may have a storage problem such as USMI. A dog that strains, has a weak stream, or never seems to empty properly may have a very different issue.

Why is it more common in female dogs?

Female dogs, particularly medium to large breed desexed females, are overrepresented in cases of USMI. There are a few likely reasons for that, and it is probably not down to just one thing.

One important factor is hormonal. Oestrogen appears to help support urethral tone and closure pressure. After desexing, reduced oestrogen exposure is thought to contribute to weaker sphincter function in some dogs, which may make leakage more likely when they are relaxed or asleep. That is part of why some female dogs respond to oestrogen-based medication.

It is probably not purely hormonal, though. Female dogs with USMI may also have differences in urethral support, bladder neck position, body size, and the structure of the urethral wall itself. Larger body size seems to matter, which may help explain why medium to large breed bitches are overrepresented. So the short version is that desexed female dogs appear more prone because of a mix of hormonal, anatomical, and mechanical factors rather than one simple cause.

Male dogs can still develop incontinence, but because it is less common, vets are often more cautious about ruling out other causes first.

How do vets diagnose it?

Diagnosis starts with the basics:

• a clear history
• physical examination
• urinalysis
• urine culture if needed

If those are normal, the next step depends on the dog’s age, sex, clinical signs, and how suspicious the case is for something more complex.

Further tests may include:

• blood tests
• abdominal ultrasound
• imaging of the urinary tract
• measurement of post-void residual urine volume
• neurological examination
• referral imaging or cystoscopy in selected cases

One useful distinction is whether the problem is a storage disorder or a voiding disorder. A dog with a normal urine stream and no straining is more likely to have a storage problem. A dog with poor emptying may leak simply because the bladder is overfull.

Cost-wise, the minimum starting point is usually a consultation and urine testing. At PMV, the standard consultation fee is currently $165. Once you add urine testing, possible urine culture, and sometimes blood work, a straightforward initial work-up can easily end up around $500 to $1,000, depending on what is needed. If a dog then needs ultrasound, advanced imaging, cystoscopy, or referral investigations, costs can move into the multiple thousands of dollars.

That is why it is worth being methodical. For some dogs, especially those with a classic pattern for USMI, the work-up may stay fairly simple. For others, particularly young males or dogs with unusual signs, spending more upfront on diagnosis may save money and frustration later.

For dogs that are anxious in clinic settings, starting that process with a mobile vet Brisbane owners can access at home may also make the whole work-up easier.

What treatments are available?

Treatment depends on the cause.

For dogs with USMI, phenylpropanolamine (PPA) remains a standard first-line treatment. It works by increasing tone in the urethral sphincter so urine is held in more effectively. It is still widely used because it works well for many dogs, although treatment decisions should always be tailored to the individual case.

In female dogs, oestrogen-based medications may also be used in some cases.

In male dogs, if response to PPA is incomplete, some clinicians may consider testosterone-based treatment in selected cases, although this is not appropriate for every dog and needs proper veterinary oversight.

If the cause is not USMI, treatment may instead involve:

• antibiotics for confirmed infection
• surgery for ectopic ureters or anatomical defects
• treatment of neurological disease
• management of prostate disease
• referral procedures such as urethral bulking agents or artificial urethral sphincters in difficult cases

There have been ongoing refinements in how urinary incontinence is investigated and managed, but the best option still depends on identifying the underlying cause first.

Is it curable?

Sometimes, but often it is better thought of as manageable rather than permanently curable.

If the cause is a urinary tract infection or a correctable anatomical defect, treatment may resolve the problem. If the cause is USMI, many dogs improve significantly with medication, but some need long-term treatment and dose adjustments over time.

When should you get your dog checked?

It is worth booking an appointment if your dog is:

• leaking urine while asleep
• dribbling without noticing
• getting recurrent urine scalding or skin irritation
• drinking more than usual
• straining to urinate
• producing a weak stream
• having repeated urinary tract infections

Even if the problem seems mild, persistent leakage is not normal and should not just be put down to age.

If your dog is leaking urine or you’re not sure whether it’s incontinence, infection, or something else, you can learn more or book a home visit at Personalised Mobile Vet.

References

Byron, J.K. (2019) ‘Micturition disorders’, in Ettinger, S.J., Feldman, E.C. and Côté, E. (eds.) Textbook of Veterinary Internal Medicine. 8th edn. St Louis, MO: Elsevier.

Forsee, K.M., Davis, G.J., Mouat, E.E. and Salmeri, K.R. (2013) ‘Evaluation of the prevalence of urinary incontinence in spayed female dogs: 566 cases (2003–2008)’, Journal of the American Veterinary Medical Association, 242(7), pp. 959–962.

Gregory, S.P. (1994) ‘Developments in the understanding of the pathophysiology of urethral sphincter mechanism incompetence in the bitch’, British Veterinary Journal, 150(2), pp. 135–150.

Reichler, I.M. and Hubler, M. (2024) ‘ACVIM consensus statement on the diagnosis and management of urinary incontinence in dogs’, Journal of Veterinary Internal Medicine.

Rose, S.A., Adin, C.A. and Ellison, G.W. (2009) ‘Surgical management of urinary incontinence in dogs’, Clinical Techniques in Small Animal Practice, 24(4), pp. 216–224.

Thrusfield, M.V. et al. (1998) ‘Acquired urinary incontinence in bitches: its incidence and relationship to neutering practices’, Journal of Small Animal Practice, 39(12), pp. 559–566.