Urinary incontinence means a dog leaks urine without meaning to, often as a wet spot where they've been sleeping or lying down.1 It's common, especially in spayed female dogs, and it's not a behavior problem: dogs usually don't know it's happening.1 Most cases can be controlled with medication, and the rest often respond to injections or surgery.1,2 This guide explains the causes, from spay incontinence to birth defects in puppies, the conditions that look like incontinence, and how it's diagnosed and treated.
See a vet promptly, or the same day, if your dog:
What the Research Shows
- It's common. About 3% of female dogs in UK veterinary practices have urinary incontinence, and spayed females are about 3 times as likely to be affected.4
- Size matters. Female dogs over 30 kg (66 lb) were 3 times as likely to be incontinent as those under 10 kg. Vizslas, Dobermanns, Weimaraners and Boxers were at highest risk.4
- Onset comes years after spaying. In a US study of 566 spayed dogs, 5.1% became incontinent, a mean of 2.3 years after surgery; dogs of 15 kg or more were 7 times as likely to be affected.5
- Spay timing may matter for big dogs. In dogs over 25 kg, each month spaying was delayed during the first year lowered the risk.6 A UK study found dogs spayed at 7 to 18 months had about 20% lower risk than those spayed at 3 to 6 months.7
- Surgery can help when medicine doesn't. An implanted hydraulic urethral sphincter gave complete continence in 90% of 20 female dogs followed for about 3 years.8
What Is Urinary Incontinence?
Urine is stored in the bladder and held in by the muscle around the urethra (the urethral sphincter). Incontinence happens when that muscle is too weak, when urine bypasses the bladder, or when the bladder overfills because it can't empty.1 It's different from a dog choosing to urinate indoors, which can be a training, anxiety or cognitive problem.3
Causes of Urinary Incontinence in Dogs
- Urethral sphincter weakness (USMI): the most common cause, mainly in spayed females.1
- Ectopic ureters: a birth defect where a ureter empties outside the bladder, causing constant dribbling in young dogs.9,1
- Bladder infections and stones, which cause urgency and accidents.1 See urinary tract infections and bladder stones in dogs.
- Overflow incontinence: a bladder that can't empty, usually because of a spinal or nerve problem, or a blockage.1
- In male dogs: less commonly, prostate disease, and sphincter weakness in some larger neutered males.10,2
Spay Incontinence (USMI)
After spaying, lower estrogen levels can weaken the urethral sphincter. Affected dogs typically leak while sleeping or relaxed but urinate normally when awake.1,2 It usually starts a few years after spaying: a mean of 2.3 years in one study and a median of about 3.7 years in another.5,6 Medium to large dogs are at much higher risk, and Dobermanns, Old English Sheepdogs, Weimaraners, Vizslas and Boxers are commonly affected.4,2
Does spay timing matter? Studies disagree. One US study found that delaying spaying during the first year reduced risk mainly in larger dogs (over about 25 kg), with no effect under 15 kg, and another found no effect of age at spay; a UK study found slightly lower risk of early-onset incontinence when spaying was done at 7 to 18 months rather than 3 to 6 months.6,5,7 Discuss timing with your vet, weighing incontinence against the other benefits and risks of spaying.
Incontinence in Puppies
A puppy that dribbles urine constantly from the start, despite normal house training, may have an ectopic ureter. Most are diagnosed at 3 to 6 months of age, and females are affected far more often.9,11 Labrador and Golden Retrievers, Siberian Huskies, Newfoundlands and English Bulldogs are predisposed.9 Many can be treated with a laser procedure through a scope or with surgery: in one series, 77% of dogs were continent afterward, some with medication, but some females still leak after treatment.9,11
Conditions That Look Like Incontinence
Dogs that drink much more than usual, for example from diabetes, Cushing's disease or kidney disease, may have more accidents and seem incontinent.3 Treating the underlying disease often helps.3 Older dogs with cognitive changes may also forget their house training.3 See diabetes in dogs and Cushing's disease.
How Vets Diagnose Incontinence
- History: when and how the leaking happens, and how much your dog drinks
- Urinalysis and urine culture to check for infection and dilute urine1,3
- Blood tests for diseases that increase thirst3
- X-rays or ultrasound for stones and anatomy, and sometimes a scope (cystoscopy) or CT scan for ectopic ureters1,9
Treatment of Urinary Incontinence
- Phenylpropanolamine (Proin and generics): tightens the urethral sphincter. FDA-approved for dogs since 2011, with a once-daily version since 2019 and a generic since 2024. Side effects can include vomiting, weight loss, high blood pressure and diarrhea, so your vet may check blood pressure.12,13
- Estriol (Incurin): an estrogen approved in 2011 for spayed females with hormone-responsive incontinence. Side effects can include poor appetite, vomiting, increased thirst and a swollen vulva.14
- Combination: the two drugs can be used together when one isn't enough.1
- Collagen injections: bulking agents injected into the urethra through a scope. In one study, 68% of dogs were continent afterward, though the effect faded within a year in some.15,1
- Surgery: options include colposuspension and an implanted artificial urethral sphincter for dogs that don't respond to medication.2,8,1
Treatment is usually lifelong. Never give human decongestants (such as pseudoephedrine) or hormone products; they can be toxic to dogs.16
Home Care for an Incontinent Dog
- Use washable, waterproof bedding and wash it often.
- Dog diapers or belly bands can help, but change them often and check the skin.3
- Keep the fur around the genitals trimmed and clean, and watch for redness or sores from urine scald, which can lead to skin and vaginal infections.3,9
- Offer frequent bathroom breaks, especially before bed.
- Never limit water or punish accidents; your dog can't help it.
Frequently Asked Questions
Why is my dog leaking urine while sleeping?
The most common reason, especially in spayed females, is a weak urethral sphincter. Infections, stones and conditions that increase thirst should also be ruled out.
Is urinary incontinence in dogs treatable?
Yes. Medication controls leaking in most dogs with spay incontinence, and injections or surgery can help many that don't respond.
Does spaying cause incontinence?
It raises the risk: spayed females are about 3 times as likely to be incontinent. Most spayed dogs never develop it, and the risk is highest in larger dogs.
Can incontinence in dogs be cured?
Ectopic ureters can often be corrected. Spay incontinence is usually controlled rather than cured, with lifelong medication.
Why is my puppy always dribbling urine?
Constant dribbling from a young age may mean an ectopic ureter. A vet can confirm it with imaging or a scope, and many can be corrected.
What are the side effects of Proin for dogs?
Possible side effects include vomiting, weight loss, high blood pressure and diarrhea. Your vet may monitor blood pressure.
Can male dogs be incontinent?
Yes, though it's less common. Causes include nerve or spinal problems, sphincter weakness in some larger neutered males and, less commonly, prostate disease.
Is my senior dog incontinent or just having accidents?
Incontinence is leaking without awareness. Accidents can come from increased thirst, cognitive changes or difficulty getting outside. A vet exam helps tell them apart.
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Sources and further reading
This article was rewritten and fact-checked on October 15, 2026 against current veterinary references and specialist guidelines:
- Van Vertloo L. Disorders of micturition in dogs and cats. Merck Veterinary Manual, March 2025.
- Holt PE. Canine urethral sphincter mechanism incompetence. In: Bojrab MJ, Monnet E, eds. Mechanisms of Disease in Small Animal Surgery, 3rd ed. Hosted by IVIS.
- Simonson A. What causes urinary incontinence in dogs and how do you treat it? PetMD, 2020.
- Pegram C, O'Neill DG, Church DB, Hall J, Owen L, Brodbelt DC. Spaying and urinary incontinence in bitches under UK primary veterinary care: a case-control study. Journal of Small Animal Practice, 2019 (VetCompass summary).
- Forsee KM, Davis GJ, Mouat EE, et al. Evaluation of the prevalence of urinary incontinence in spayed female dogs: 566 cases (2003–2008). Journal of the American Veterinary Medical Association, 2013 (dvm360 journal scan).
- Byron JK, Taylor KH, Phillips GS, Stahl MS. Urethral sphincter mechanism incompetence in 163 neutered female dogs: diagnosis, treatment, and relationship of weight and age at neuter to development of disease. Journal of Veterinary Internal Medicine, 2017.
- Pegram C, et al. Spaying dogs later lowers urinary incontinence risk, study finds. VN Online, July 2024 (summarizing a VetCompass study in PLOS ONE, 2024).
- Long-term outcome of female dogs treated with static hydraulic urethral sphincter for urethral sphincter mechanism incompetence. Journal of the American Animal Hospital Association, 2018.
- Sanderson SL. Ureteral anomalies in animals. Merck Veterinary Manual, September 2024.
- Kutzler MA. Prostatic diseases in small animals. Merck Veterinary Manual, September 2025.
- American College of Veterinary Surgeons. Ectopic ureter, 2023.
- U.S. Food and Drug Administration. FDA approves Proin ER tablets for controlling urinary incontinence in dogs. CVM Update, April 2019.
- U.S. Food and Drug Administration. FDA approves first generic phenylpropanolamine hydrochloride chewable tablets for use in dogs. CVM Update, June 2024.
- FDA approves first drug to treat urinary incontinence in female dogs. Veterinary Practice News, July 2011.
- Barth A, Reichler IM, Hubler M, Hässig M, Arnold S. Evaluation of long-term effects of endoscopic injection of collagen into the urethral submucosa for treatment of urethral sphincter incompetence in female dogs: 40 cases. Journal of the American Veterinary Medical Association, 2005.
- Pet Poison Helpline. Decongestants.
About this article
Last updated : fully rewritten and combined with our former incontinence pages, using the Merck Veterinary Manual, the American College of Veterinary Surgeons, the FDA, IVIS-hosted texts and published VetCompass and US studies; added causes, spay incontinence and spay timing, ectopic ureters, look-alike conditions, diagnosis, medications, surgery, home care, a key takeaways summary and FAQ.
This page is for general information and is not a substitute for an exam by your veterinarian.
