CONDITION
Ectopic Ureters
Ectopic ureters are a developmental difference in the urinary tract, present from birth, in which one or both of the tubes that carry urine from the kidneys (the ureters) connect to the bladder or urethra in an unusual position. This altered anatomy can interfere with normal urine storage and release, and in many cases leads to urine leaking without the animal appearing to notice or strain. Owners often first observe persistent dampness around the vulva or prepuce, wet bedding, or a smell of urine on the coat, sometimes from a young age. The pattern can look different from typical house-training struggles because the leakage tends to be continuous or occurs during rest, rather than in discrete accidents. Some animals show no outward signs at all, and the anatomy is noticed only during investigation of a recurring urinary tract infection or imaging performed for another reason. This page explores the signals that may bring ectopic ureters to attention, the developmental and anatomical background, how the condition is investigated through imaging and other means, and the range of surgical and medical approaches that exist to manage it. The goal is to help you understand what may be occurring and what shape conversations about next steps might take.
Why this matters now
Ectopic ureters are present from birth, reflecting a developmental difference that occurs during formation of the urinary system in the womb. Signs often become apparent in puppies or kittens during the first few months of life, though in some cases the pattern may not be recognised until adolescence or even adulthood, particularly if the alteration is subtle or affects only one ureter. Certain breeds, including Golden Retrievers, Labrador Retrievers, Siberian Huskies, and Entlebucher Mountain Dogs in dogs, and occasionally domestic shorthair cats, tend to be represented more frequently in published case series, though the condition can occur in any breed or mixed-breed animal.
The anatomical difference itself does not change over time, but the consequences may become more evident as the animal matures. In some individuals, signs remain mild and stable, particularly if the abnormal connection still allows partial function of the bladder's storage mechanism. In others, ongoing leakage can lead to skin irritation from chronic moisture, recurrent urinary tract infections from altered anatomy and reduced normal flushing, or progressive frustration for both owner and animal as the pattern persists despite house-training efforts. The variation between individuals can be wide, and some animals with ectopic ureters identified on imaging may show minimal outward signs throughout their lives.
Signals & patterns
Early signals
Persistent dampness around vulva or prepuce
The fur in the area may feel wet to the touch, or you may notice a damp patch on bedding after the animal has been resting. This tends to be present from a young age and does not resolve with maturation or house-training.
Urine odour on coat or bedding
A characteristic ammonia-like smell may cling to the hindquarters or be noticeable on blankets and sleeping areas, even when the animal has not visibly urinated. The odour often persists despite bathing.
Continuous or intermittent dribbling
Small amounts of urine may leak throughout the day, sometimes without the animal appearing to notice or adopt a posture to urinate. This pattern can occur during rest or activity and may be mistaken for incomplete house-training in young animals.
Normal urination also observed
Many animals with ectopic ureters still pass urine in a typical posture and location, particularly if only one ureter is affected or if the bladder retains some storage capacity. The leakage occurs alongside, rather than instead of, these more recognisable urination events.
Skin redness or irritation around genitals
Chronic moisture from leaking urine can lead to inflammation or soreness of the skin in the vulvar or preputial area. The tissue may appear pink, inflamed, or uncomfortable, and the animal may lick the region more frequently.
Later signals
Recurrent urinary tract infections
Altered anatomy can make it easier for bacteria to reach the bladder and harder for the system to flush them out during normal urination. Owners may notice repeated episodes of straining, discomfort, or cloudy urine over weeks to months.
Thickened or discoloured skin folds
Prolonged exposure to urine can cause the skin around the vulva or prepuce to become darker, thicker, or develop a rough texture. These changes reflect chronic low-grade inflammation and moisture damage.
Behavioural frustration or withdrawal
Some animals may become quieter, avoid bedding, or seem reluctant to settle, particularly if skin irritation or repeated urinary tract infections cause discomfort. The pattern can be subtle and may be attributed to temperament rather than physical causes.
Click to read about the biological mechanisms
How this is usually investigated
Investigation typically begins with a detailed history of when and how the leakage occurs, whether the animal can urinate voluntarily, and whether urinary tract infections have been a recurring feature. Physical examination may reveal dampness around the vulva or prepuce, and in some cases the bladder may feel small or underfilled on palpation. Imaging is usually needed to confirm the anatomical difference and to map where each ureter connects, as the signs alone do not distinguish ectopic ureters from other causes of incontinence.
Physical examination and history
Ultrasound of the urinary tract
Contrast radiography (excretory urography)
Computed tomography (CT) with contrast
Cystoscopy
Options & trade-offs
Management is usually shaped by the severity of leakage, the anatomy identified on imaging, and what degree of ongoing moisture or medication the household finds workable. Some animals are managed with a combination of approaches, and the balance may shift over time as the animal matures or as the household's circumstances change. What works well for one individual may be less practical for another, and the goal is to find a pattern that the animal and owner can sustain.
Surgical repositioning of the ureter
The ureter is detached from its ectopic location and reimplanted into the bladder at a position that allows the bladder wall to compress the opening during filling, recreating the valve mechanism. This can be performed through an open abdominal incision or, in some cases, using minimally invasive techniques. The procedure is typically performed by a specialist surgeon, and may involve one or both ureters depending on the anatomy.
Trade-offs: Surgery carries anaesthetic risk, and healing of the new ureter insertion can occasionally be incomplete, leading to urine leakage into the abdomen or persistent incontinence if the bladder sphincter has not developed normal tone. Some animals show marked improvement after surgery, while others continue to leak to a lesser degree and may still require medication to improve sphincter function.
Medication to increase urethral sphincter tone
Drugs such as phenylpropanolamine or, less commonly, oestrogen derivatives in females can increase the muscle tone around the urethra, reducing passive leakage. These medications do not alter the anatomical difference but may improve continence by tightening the outflow pathway. They are usually given daily, and the dose may be adjusted over time.
Trade-offs: Medication does not correct the underlying anatomy, so leakage may persist to some degree, particularly during rest or excitement. Side effects can include restlessness, changes in appetite, or, with long-term oestrogen use, effects on bone marrow, so periodic monitoring may be discussed. Some animals respond well and remain comfortable on medication alone, while others show little change.
Management of recurrent urinary tract infections
Animals with ectopic ureters may develop bacterial infections more frequently because the altered anatomy reduces normal flushing. When infections occur, urine culture can guide antibiotic choice. Some clinicians discuss longer courses of antibiotics or, in selected cases, low-dose prophylaxis between episodes, though the balance between suppressing infection and encouraging resistance varies between individuals.
Trade-offs: Repeated or prolonged antibiotic use can select for resistant bacteria, and some owners find frequent urine sampling and clinic visits difficult to sustain. Addressing the anatomical cause through surgery or medication may reduce infection frequency, though not all animals become infection-free even after correction.
Hygiene and skin care
Keeping the skin around the vulva or prepuce clean and dry can reduce irritation from chronic moisture. This may involve regular gentle bathing, clipping hair short in the affected area, and applying barrier creams or powders. Some owners use absorbent bedding or washable nappies to manage dampness in the home.
Trade-offs: This approach does not reduce leakage but can make the animal more comfortable and the household easier to manage. It suits animals with mild leakage or those in which surgery or medication is not pursued, though it requires ongoing effort and may not be practical in all households.
Observation without active intervention
In animals with minimal leakage, no skin irritation, and no recurrent infections, some owners and clinicians agree to monitor the pattern over time without immediate treatment. The anatomy remains unchanged, but if the animal and household are comfortable, intervention may be deferred or declined altogether.
Trade-offs: This approach avoids the risks and costs of surgery or medication, but leakage may worsen with age or weight gain, and infections can develop unpredictably. It suits animals with very mild signs and owners able to tolerate some ongoing dampness, though the threshold for intervention varies widely between households.
Common misconceptions
"If the puppy is still young, house-training will eventually resolve the leakage."
Ectopic ureters produce leakage that occurs without the animal's awareness or control, often during rest or sleep, and this pattern does not respond to training. The leakage reflects an anatomical difference in where the ureter connects, not a behavioural or learning issue. Animals with ectopic ureters may still urinate voluntarily from urine stored in the bladder, which can make the distinction harder to recognise early on.
"Surgery always cures the incontinence completely."
Surgical repositioning of the ureter can improve continence markedly in many animals, but some continue to leak after surgery because the urethral sphincter itself may not have developed normal tone, particularly if the bladder has been chronically underfilled since birth. Post-surgical incontinence may still respond to medication, and the combination of surgery and medication often produces better control than either approach alone. The degree of improvement varies between individuals.
"Ectopic ureters only affect female dogs."
While female dogs are diagnosed more frequently, ectopic ureters occur in males and in cats of both sexes. Leakage in males may be less obvious because the longer urethra provides more resistance to passive flow, and some males show only recurrent infections or dampness rather than overt incontinence. The anatomical difference itself does not respect sex, though the outward signs can vary with anatomy.
Related conditions
Urinary Tract Infection in Dogs
Ectopic ureters can predispose to urinary tract infections because the altered anatomy may interfere with normal bladder emptying and create conditions in which bacteria can establish more easily. In some cases, recurring infection is the first signal that brings the anatomical difference to attention.
Urinary Incontinence
Urinary incontinence can occur both as a consequence of ectopic ureters and from other causes entirely, and distinguishing between them often requires imaging to identify where the ureters connect. Both patterns may appear as involuntary leakage, though the timing and distribution of dampness can offer clues.
Hydronephrosis
Hydronephrosis may develop in kidneys drained by ectopic ureters if the abnormal connection impedes urine flow, causing the kidney's collecting system to swell over time. In other cases, both the ectopic ureter and hydronephrosis are noticed together during imaging, and the degree of kidney swelling can influence decisions about management.
Ureteral Obstruction in Cats
Ureteral obstruction and ectopic ureters are distinct conditions affecting the ureters, but both can disrupt the normal passage of urine from the kidney and sometimes come to attention through similar imaging pathways. Understanding where and how the ureter is affected helps distinguish a structural difference present from birth from an acquired blockage.
Pyelonephritis
Pyelonephritis can develop when bacteria travel upward through a urinary tract already compromised by ectopic ureters, particularly if urine stasis or incomplete bladder emptying creates favourable conditions for infection to ascend. In some animals, kidney infection may be the first clinical event that prompts investigation of the underlying anatomy.
If leakage or recurrent infections have been a feature in your animal, understanding the anatomical background can help frame conversations about imaging and the shape that management might take. The Metabolic Health section of this resource includes other conditions that can affect the urinary tract, and some animals with ectopic ureters may have additional developmental differences that become relevant over time. Observations about when and how the leakage occurs, and what degree of moisture the household finds manageable, tend to be useful detail to carry into any discussion about next steps.