Ectopic Ureters in Dogs: Why Your Puppy Keeps Leaking Urine

By Dr Duncan Houston

A puppy that leaves a damp patch while asleep or dribbles urine while walking is not deliberately ignoring toilet training. Involuntary leakage needs a medical assessment.

An ectopic ureter is one possible cause, particularly when leakage began early in life. Recognising the pattern can spare a family months of frustration and give the puppy relief from wet, irritated skin.

Quick Answer

An ectopic ureter is a tube from the kidney that opens in the wrong place instead of delivering urine normally into the bladder. It can cause constant or intermittent leakage even when a dog also urinates normally. Diagnosis often requires advanced imaging or cystoscopy, and treatment depends on the anatomy. Correction can improve continence, but some dogs also need ongoing treatment for weak urethral closure or other problems.

How can a puppy leak but still pass a normal stream?

One ureter may be affected while the other enters the bladder normally. Even with both affected, urine can still collect and be passed voluntarily in some anatomical arrangements. A normal-looking wee therefore does not exclude the defect.

Leakage may be most noticeable during sleep, movement or excitement. Wet fur, genital licking, urine odour and skin irritation are practical clues. Young female dogs are commonly recognised, but males and older dogs can also be affected.

Intramural and extramural: why the distinction matters

An intramural ureter runs within the bladder wall before opening too far along the urinary tract. An extramural ureter bypasses the usual route. The ACVS ectopic ureter overview describes why the first may be suitable for cystoscopic laser treatment, while the second generally requires surgical relocation.

The words sound technical, but they answer an important owner question: which procedure can actually correct this dog's plumbing?

How urgent is urine leakage?

What else could explain accidents?

Incomplete toilet training usually involves deliberate squatting or leg lifting, while incontinence is involuntary. However, the distinction is not always obvious from one incident.

Urinary infection, bladder stones, excessive thirst, neurological disease and weak urethral sphincter function can cause or worsen accidents. Infection may accompany an ectopic ureter, so improvement on antibiotics does not necessarily exclude the structural problem.

How do vets make the diagnosis?

The first visit includes a detailed history and examination, with urine testing and often a urine culture. Blood tests assess general health and kidney function. Ultrasound may identify abnormalities, but a normal scan does not reliably rule out every ectopic ureter.

Contrast CT can map the kidneys and ureters. Cystoscopy uses a small camera to inspect the urethra and bladder openings and may allow treatment during the same anaesthetic. The specialist chooses tests that define the anatomy and look for associated abnormalities.

When is this an emergency?

Repeated straining without a normal urine stream, severe pain, vomiting with weakness or collapse requires urgent care. A leaking dog can still develop obstruction or another serious urinary complication. Do not assume a few drops mean the bladder is emptying safely.

After a procedure, rapidly worsening abdominal discomfort, marked lethargy or inability to urinate should be reported immediately to the surgical team.

What can treatment achieve?

For suitable intramural ureters, a specialist may open the abnormal tunnel using a cystoscope and laser. Other arrangements require open surgery to create the correct drainage route. Removing a kidney is reserved for carefully selected cases with serious loss of function, after assessment of the remaining kidney.

Published clinical outcome research in dogs shows that surgical approach and associated abnormalities affect results. Anatomical correction and complete dryness are different outcomes. Medication or further continence procedures may still be needed.

Your practical action plan

1. Record whether leakage occurs asleep, awake or while actively toileting.
2. Take photographs of skin irritation and keep a short accident diary.
3. Ask whether urine culture and imaging are needed before referral.
4. Discuss realistic continence expectations, procedure risks and follow-up costs.
5. After treatment, follow the prescribed activity restrictions and report leakage trends rather than judging success from one dry night.

Common mistakes

• Punishing a puppy for involuntary leakage.
• Restricting drinking water to keep bedding dry.
• Using antibiotics repeatedly without confirming infection.
• Assuming laser treatment guarantees lifelong complete continence.
• Leaving wet nappies or bedding against irritated skin.

Protecting skin and preventing setbacks

Keep bedding clean and dry, gently clean urine-soaked fur and ask which barrier products are safe if licking is possible. Provide frequent toileting opportunities and fresh water. This congenital abnormality cannot be prevented through house-training, but earlier recognition can reduce prolonged irritation and untreated infection.

Frequently asked questions

Will my puppy grow out of an ectopic ureter?

The misplaced opening does not normally correct itself with maturity. A proper diagnostic and treatment plan is needed.

Can male dogs have ectopic ureters?

Yes. They may be recognised differently and should not be excluded based on sex.

Does continued leakage mean surgery failed?

Not necessarily. Weak sphincter function, infection or another abnormality may remain after correct ureter placement.

Should affected dogs be bred?

Discuss inherited risk with the vet and breed organisation. Breeding an affected dog is generally discouraged.

Persistent dribbling deserves investigation, not blame. With clear anatomy and realistic goals, many families find a substantially more comfortable and manageable path forward.

For help preparing a urinary history and referral questions, visit ASK A VET™.