Dog Losing Bladder Control: Causes and Next Steps

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-10-02

Dog losing control of bladder means urine leaks without your dog choosing to urinate. It is a medical sign, not a behavior problem, and it has many possible causes. Some are mild and easy to manage, while others need urgent care.

This article is educational and is not a substitute for veterinary diagnosis or treatment.

Quick Answer

• Urinary incontinence is the unconscious passage of urine, so your dog may leave a wet spot where they were lying or dribble while walking [1].
• The most common cause in middle-aged and older spayed females is urethral sphincter mechanism incompetence, a weakness of the muscle that holds urine in [2].
• Young dogs with leakage from birth often have a congenital problem such as an ectopic ureter, which needs imaging and often surgery [3].
• A urinary tract infection, bladder stones, or spinal disease can all look like incontinence, so testing matters more than guessing.
• Do not withhold water to stop the leaking. That causes dehydration and makes urine more concentrated, which irritates the bladder.

What Incontinence Actually Looks Like

True incontinence is different from a dog who urinates in the house on purpose. With incontinence, urine comes out during the storage phase of urination, when the bladder should be holding urine quietly [2]. Your dog may not seem aware it is happening.

Common signs include:

• A pool of urine left where your dog was sleeping or resting [1]
• Dribbling urine while walking or standing [1]
• Wet fur around the vulva or prepuce, sometimes with red, irritated skin from urine scalding [1]
• A strong urine smell on bedding that returns quickly after washing
• Licking at the genital area more than usual

How to tell it apart from marking or a house-training problem

Marking is deliberate. A dog who marks usually deposits small amounts of urine on vertical surfaces, and the behavior often has a social or territorial trigger. A dog with incontinence leaks a larger volume, often while relaxed or asleep, and does not posture to urinate.

A house-training lapse is also different. A dog who was reliably trained and suddenly urinates indoors may have a medical problem, but they usually squat and produce a full stream on purpose. If you cannot tell which one you are seeing, keep a simple log of when and where the wet spots happen. That log is genuinely useful to your veterinarian.

How to tell it apart from a urinary tract infection

A urinary tract infection often causes frequent small urinations, straining, blood in the urine, or accidents in a previously reliable dog. Incontinence is leakage without a conscious attempt to urinate. The two can overlap, and an infection can make existing incontinence worse. A urinalysis and urine culture are the only reliable way to sort this out.

Main Causes of a Dog Losing Control of Bladder

Urethral sphincter mechanism incompetence

This is the single most common cause of leakage in adult dogs, especially spayed females. The urethral sphincter is the muscle that keeps urine in the bladder. When it is weak, urine leaks out during storage [1]. Most veterinarians treat a suspected case with a medication trial, and the first-choice drug is phenylpropanolamine [2]. In one small study of young bitches with a congenital form of this condition, all were started on phenylpropanolamine at 1.5 mg/kg orally once daily for at least a month [4]. Your veterinarian will calculate the exact dose from your dog's weight and health.

Congenital causes in young dogs

If your puppy has leaked since you brought them home, a birth defect is likely. An ectopic ureter is a ureter that bypasses the bladder and connects somewhere else, so urine never gets stored properly [3]. Female dogs are affected more often than males [3]. This condition requires surgical correction, and minimally invasive techniques such as laparoscopic ureteroneocystostomy and cystoscopically guided laser ablation have been used successfully without converting to open surgery [3].

Infections, stones, and blockage

A urinary tract infection irritates the bladder lining and can cause urgency and accidents. Bladder stones can do the same and may partially block the flow of urine. If the flow of urine is blocked, the kidneys can become enlarged and damaged, and a complete blockage in both kidneys is rapidly fatal [8]. Watch for straining with little or no urine produced. That is an emergency.

Nerve and spinal problems

A dog with a spinal injury or nerve disease may have a bladder that does not empty normally. Urine then overflows, which looks like incontinence. Signs often include weakness in the back legs, a wobbly walk, or a change in tail position. These dogs need a neurologic exam, not just a urine test.

Bladder rupture

This is rare but serious. One reported case involved a 10-year-old male dog with vomiting and no urine production, and no trauma was reported by the owner [5]. Chronic inflammation and fibrosis had weakened the bladder wall until it tore [5]. If your dog stops producing urine and seems painful or bloated, go to an emergency clinic.

Lower back pain as a hidden factor

Some dogs with leakage also have lower back pain, and treating the back pain has improved or resolved the incontinence in reported cases [7]. In one case report, a young spayed poodle with leakage that did not respond to standard drugs became continent within two days of treatment for lower back pain using manual therapy, acupuncture, and photobiomodulation [6]. This does not mean every leaky dog has back pain, but it is worth mentioning to your veterinarian if your dog seems stiff or sore.

Red Flags That Mean Emergency Care Now

Go to an emergency clinic immediately if you see any of these:

• Your dog is straining to urinate and nothing or only drops come out
• Your dog has not produced urine for many hours
• The abdomen looks swollen, feels tight, or is painful to touch
• Vomiting with no urine production [5]
• Collapse, pale gums, or extreme weakness
• Blood in the urine with obvious pain

A complete urinary blockage can kill a dog quickly, and bladder rupture is a surgical emergency [8][5]. Do not wait to see if it improves on its own.

Safe Things You Can Do at Home While You Wait

You cannot fix incontinence at home, but you can protect your dog and your home while you arrange a visit.

• Do not restrict water. Offer normal amounts unless your veterinarian tells you otherwise.
• Keep the urine area clean and dry. Urine sitting on skin causes scalding and dermatitis [1].
• Use a barrier cream made for pets around the genital area if the skin looks red, after checking with your vet.
• Put waterproof pads or washable bed liners where your dog rests.
• Take your dog out more often, including a late-night trip.
• Keep a log of leak times, volume, and whether your dog seemed aware of it.
• Do not give human incontinence medications. Some are toxic to dogs, and dosing is not the same.

If your dog is leaking and also shedding heavily, that is usually a separate issue. You can read about Dog Shedding Out Of Control and Dog Shedding Control for that problem.

What Your Veterinarian Will Check and Test

Diagnosis starts with a careful history and a full physical exam, including watching your dog urinate if possible [1]. Your veterinarian will likely ask when the leaking started, whether it happens during sleep, and whether your dog seems aware of it.

Expect some of these tests:

• Urinalysis to look for infection, crystals, and blood [1]
• Urine culture and sensitivity to confirm infection and pick the right antibiotic
• Blood work to check kidney function and general health
• Abdominal ultrasound to look at the bladder, kidneys, and stones
• X-rays with contrast or CT urography to trace the urinary tract, which is used more often in some countries than others [2]
• Urethral pressure profilometry to measure sphincter strength, though this is uncommon in general practice [2]

If a sphincter problem is suspected, many veterinarians start a medication trial before advanced testing [2]. If your dog does not respond, imaging and further testing become more important.

Treatment Options That Actually Help

Treatment depends on the cause, so the right answer for your dog may be very different from your neighbor's dog.

• Phenylpropanolamine is the first-choice medication for sphincter weakness and is often started as a trial [2]. In one study, bitches with a congenital form received 1.5 mg/kg orally once daily for at least a month [4].
• Hormone therapy such as estriol is sometimes used alongside or instead of other drugs, and one case report described a dog on maximal doses of both phenylpropanolamine and estriol [6].
• Surgery corrects ectopic ureters, and minimally invasive approaches have been successful in reported cases [3].
• A urethral hydraulic occluder is a surgical option for dogs that do not respond to medication [6].
• Treating lower back pain with manual therapy, acupuncture, and photobiomodulation resolved leakage in reported cases [6][7].
• Managing the underlying infection, stones, or spinal disease is the real treatment when those are the cause.

If your dog is also losing hair or has skin problems, those may be separate conditions. See Why Is My Dog Losing Hair? for more on that topic.

Prevention and Monitoring

You cannot prevent every cause of incontinence, but you can lower the risk and catch problems early.

• Keep up with wellness visits so infections and stones are found before they cause damage.
• Ask your veterinarian about the timing of spaying, since spayed females are more commonly affected by sphincter weakness [2].
• Watch for changes in urination habits, including frequency, straining, and accidents.
• Keep bedding dry and check your dog's skin weekly for redness or odor.
• If your dog is on incontinence medication, follow up as scheduled. Response is often judged over weeks, not days [4].
• Mention any stiffness, reluctance to jump, or back sensitivity at every visit, since back pain can be linked to leakage [7].

If shedding is adding to your cleanup load, Keep Dog Shedding Under Control and Dog Hair Control Shedding cover practical options.

Limitations and When to Contact a Veterinarian

This article cannot tell you what is causing your dog's leakage. Only a veterinarian who examines your dog and runs tests can do that.

Contact your veterinarian the same day if your dog has blood in the urine, is straining, seems painful, or has sudden weakness in the back legs.

Go to an emergency clinic right away if your dog cannot pass urine, has a swollen or painful abdomen, is vomiting with no urine output, or collapses [8][5].

Schedule a routine visit soon if your dog has ongoing leakage without pain, especially if the skin around the genital area is red or irritated [1]. Early treatment prevents skin damage and often makes management much easier.

Frequently Asked Questions

Is it normal for an older dog to lose bladder control?

No, it is common but not normal. Age-related muscle weakness in the urethral sphincter is a frequent cause, and it usually responds to medication. A veterinary visit is still needed to rule out infection, stones, and other problems.

Can a urinary tract infection cause incontinence?

Yes, an infection can cause accidents and urgency that look like incontinence. It can also make existing sphincter weakness worse. A urinalysis and culture are needed to confirm it and choose the right antibiotic.

Will my dog need surgery for incontinence?

Most dogs with sphincter weakness do not need surgery. Surgery is mainly used for structural problems such as ectopic ureters or for dogs that do not respond to medication [3][6]. Your veterinarian will discuss the options based on the diagnosis.

Should I take away my dog's water to stop the leaking?

No. Withholding water causes dehydration and concentrates the urine, which irritates the bladder. Offer normal amounts of water unless your veterinarian gives you a specific reason to limit it.

Can back pain really cause a dog to leak urine?

It can be a contributing factor in some dogs. Reported cases show that treating lower back pain improved or resolved leakage in dogs with sphincter incompetence [6][7]. If your dog seems stiff or sore, mention it to your veterinarian.

Related Articles

• Dog Shedding Out Of Control
• Dog Shedding Control
• Dog Hair Control Shedding
• Why Is My Dog Losing Hair?
• Keep Dog Shedding Under Control
• Dog Straining to Urinate: Causes and When It's an Emergency

References

1. Disorders of Micturition in Dogs and Cats - Urinary System. Merck Veterinary Manual.
2. An international survey on canine urinary incontinence: case frequency, diagnosis, treatment and follow-up. Frontiers in veterinary science, 2024.
3. Minimally Invasive Surgical Techniques for the Treatment of Dogs with Urinary Incontinence Due to Ureteral Ectopia. Life (Basel, Switzerland), 2025.
4. Congenital urethral sphincter mechanism incompetence: observational clinical findings and treatment outcomes-a small retrospective study in 19 bitches. Acta veterinaria Scandinavica, 2026.
5. Spontaneous urinary bladder rupture in a dog with lymphoplasmacytic cystitis. The Journal of small animal practice, 2025.
6. Treatment of lower back pain to resolve symptoms of canine urethral sphincter mechanism incontinence. Open veterinary journal, 2025.
7. The relationship between urethral sphincter mechanism incompetency and lower back pain: Positing a novel treatment for urinary incontinence in dogs. Open veterinary journal, 2022.
8. Noninfectious Diseases of the Urinary System in Dogs - Dog Owners. Merck Veterinary Manual.

Further Reading

• Merck Veterinary Manual: Dog Owners
• Cornell Richard P. Riney Canine Health Center: Canine Health Information
• American Veterinary Medical Association: Pet Care