Urinary tract infections are one of the most common bacterial infections diagnosed in dogs. While they are typically straightforward to treat when caught early, an untreated UTI can progress to a kidney infection, develop into a chronic problem, or in male dogs cause a dangerous urinary blockage.
If your dog is straining to urinate, urinating more frequently than usual, or showing blood in their urine, contact Walker Lake Veterinary Centre at (587) 786-6771 for an assessment.
UTIs are significantly more common in female dogs than males due to the shorter, wider urethra that allows bacteria to travel more easily to the bladder. However, UTIs in male dogs are less common and when they do occur, often indicate an underlying problem such as prostate disease or bladder stones.
The Urinary Tract — A Brief Overview
The urinary tract includes the kidneys, ureters, bladder, and urethra. A UTI most commonly affects the lower urinary tract — the bladder (cystitis) and urethra (urethritis). When infection ascends to the kidneys, it becomes a more serious condition called pyelonephritis.
Bacteria — most commonly Escherichia coli (E. coli) from the gastrointestinal tract — are the most frequent cause of UTIs in dogs. Less commonly, other bacteria including Staphylococcus, Proteus, Klebsiella, and Enterococcus are involved.
Signs and Symptoms of UTI in Dogs
The classic signs of a lower urinary tract infection in dogs are relatively consistent and recognisable once you know what to look for.
Common Signs
- Increased frequency of urination — going outside to urinate more often than normal
- Straining to urinate — squatting or posturing for longer than usual with little or no urine produced
- Small amounts of urine produced despite frequent attempts
- Blood in the urine — urine may appear pink, red, or brown
- Cloudy or foul-smelling urine
- Urinating in inappropriate locations — dogs that are house-trained may begin having accidents indoors
- Excessive licking of the genital area
- Whimpering or showing discomfort while urinating
Less Common Signs
- Lethargy and reduced appetite — more common when infection has spread to the kidneys
- Fever — indicates a more serious upper urinary tract infection
- Back pain or hunched posture — suggests kidney involvement
- Increased thirst alongside increased urination
⚠️ A male dog that is straining to urinate and producing no urine at all may have a urinary blockage rather than a simple UTI. This is a life-threatening emergency. If your male dog has been trying to urinate without success for more than an hour, go to the vet immediately.
What Causes UTIs in Dogs?
Bacterial Contamination
In most cases, UTIs develop when bacteria from the skin around the genitals or from the gastrointestinal tract ascend through the urethra into the bladder. Factors that increase this risk include:
- Female anatomy — the shorter, wider urethra
- Urinary incontinence — urine pooling near the vulva or prepuce creates a moist environment for bacteria
- Obesity — excess skin folds around the vulva in overweight females
- Recumbency — dogs that spend significant time lying down due to illness or mobility issues
- Immunosuppression — dogs on long-term steroid medication or with diseases affecting immune function
Underlying Conditions That Predispose to UTIs
A single UTI in a previously healthy dog is often straightforward to treat. Recurrent UTIs — two or more per year — almost always have an underlying predisposing condition. Common underlying causes include:
Bladder Stones (Uroliths)
Mineral crystals and stones in the bladder provide a surface for bacteria to adhere to and protect them from the immune response and antibiotics. UTIs associated with bladder stones frequently recur until the stones are removed or dissolved.
Bladder Tumour
Transitional cell carcinoma — the most common bladder tumour in dogs — produces signs identical to a UTI and can also predispose to secondary bacterial infections. Dogs with recurrent or treatment-resistant UTIs, particularly older female dogs of predisposed breeds (Scottish Terriers, Shetland Sheepdogs, Beagles), should be assessed for bladder tumour.
Prostate Disease
Male dogs with prostatitis (prostate infection) or benign prostatic hyperplasia (prostate enlargement) frequently develop recurrent UTIs because the prostate is difficult to penetrate with antibiotics and serves as a persistent bacterial reservoir.
Diabetes Mellitus
High glucose levels in the urine of diabetic dogs create an ideal growth environment for bacteria. UTIs are very common in diabetic dogs and often recur until diabetes is well controlled.
Hyperadrenocorticism (Cushing’s Disease)
The chronically elevated cortisol levels in Cushing’s disease suppress immune function, making affected dogs highly susceptible to UTIs and other infections.
Anatomical Abnormalities
Recessed vulva — a condition where the vulva is hidden within surrounding skin folds — is a common anatomical predisposition to recurrent UTIs in female dogs, particularly those that are overweight or have been spayed before full maturity.
Diagnosing a UTI
Urinalysis
The first and most important diagnostic step. A urine sample is examined for the presence of white blood cells (indicating inflammation), red blood cells (indicating bleeding or irritation), bacteria, and crystals. The urine’s concentration, pH, and protein levels provide additional useful information.
The ideal sample for diagnosing a UTI is collected by cystocentesis — a needle inserted through the abdominal wall directly into the bladder under ultrasound guidance. This method collects sterile urine directly from the bladder, avoiding contamination from the skin or genital area that makes free-catch samples less reliable for bacterial culture.
Urine Culture and Sensitivity
A culture grows any bacteria present in the urine and identifies the specific organism. Sensitivity testing then determines which antibiotics will effectively kill that organism. This is the most accurate guide to antibiotic selection and is particularly important for recurrent UTIs where resistant bacteria are more likely.
Results take 2 to 5 days, so initial treatment may begin based on urinalysis findings with adjustments made once culture results are available.
Imaging — Ultrasound and X-Rays
Bladder ultrasound assesses the bladder wall for thickening, masses, and stones. X-rays detect calcium-containing bladder stones. These diagnostics are particularly important in dogs with recurrent UTIs to identify underlying structural causes.
Treating UTIs in Dogs
Antibiotics
Antibiotics are the primary treatment for bacterial UTIs. The choice of antibiotic, dose, and duration are guided by the culture and sensitivity results where available, or by clinical judgement based on urinalysis findings for straightforward first-time infections.
Duration of treatment is important. For uncomplicated lower UTIs, 7 to 14 days of antibiotics is typically appropriate. For complicated UTIs — those involving kidney infection, prostate disease, or underlying structural abnormalities — longer courses of 4 to 6 weeks or more may be required.
⚠️ Never stop an antibiotic course early even if your dog appears to have recovered. Incomplete treatment allows partially resistant bacteria to survive and repopulate, leading to a recurrence that is harder to treat. Always complete the full prescribed course.
Treating Underlying Causes
For recurrent UTIs, treating the underlying predisposing condition is essential. This may involve:
- Surgical removal or dietary dissolution of bladder stones
- Surgical correction of recessed vulva
- Medical or surgical management of prostate disease
- Management of diabetes or Cushing’s disease
- Weight loss to reduce vulvar skin folds
Supportive Care
Ensuring adequate water intake helps flush bacteria from the bladder and dilutes urine, reducing bacterial concentration. Encouraging frequent opportunities to urinate prevents urine from sitting in the bladder for extended periods.
Follow-Up Urinalysis and Culture
A repeat urinalysis and culture 5 to 7 days after completing treatment confirms that the infection has resolved. This step is frequently skipped but is important — clinical signs may resolve before the infection is fully cleared, and confirming sterile urine prevents the assumption of cure when bacteria persist.
Preventing UTIs in Dogs
Maintain Good Hydration
Dogs that drink adequate water produce more dilute urine and urinate more frequently, reducing the time bacteria have to multiply in the bladder. Ensure constant access to fresh water and consider a water fountain if your dog is a reluctant drinker.
Regular Toilet Opportunities
Allow your dog to urinate frequently — holding urine for extended periods allows bacterial numbers to increase. Multiple daily walks and regular garden access help maintain a healthy urination schedule.
Keep the Genital Area Clean and Dry
For dogs prone to UTIs — particularly females with recessed vulva or dogs with urinary incontinence — keeping the perigenital area clean and dry reduces bacterial load near the urethral opening.
Weight Management
Maintaining a healthy body weight reduces vulvar skin fold formation in female dogs, one of the most significant anatomical risk factors for recurrent UTIs.
Regular Veterinary Monitoring
Dogs with known predisposing conditions — diabetes, Cushing’s disease, bladder stones — benefit from regular urinalysis monitoring to detect UTIs early before clinical signs develop.
If your dog is showing signs of a UTI, book an appointment at Walker Lake Veterinary Centre. Call (587) 786-6771 or book online. Located at 5109 22 Avenue SW, Southwest Edmonton.
Book an Appointment at Walker Lake Veterinary Centre
Walker Lake Veterinary Centre provides urinalysis, urine culture, ultrasound, and complete urinary tract assessment for dogs and cats across Walker Lake, Summerside, Ellerslie, Heritage Valley, and Southwest Edmonton.
Call us at (587) 786-6771 or book online. We are located at 5109 22 Avenue SW, Edmonton.
Clinic hours:
- Monday, Tuesday & Thursday: 9:00 AM – 7:00 PM
- Wednesday & Friday: 9:00 AM – 6:00 PM
- Saturday: 9:00 AM – 3:00 PM
- Sunday: Closed
Frequently Asked Questions
How do I know if my dog has a UTI or just needs to go to the toilet more often?
A dog that suddenly begins urinating more frequently, straining to produce urine, having accidents indoors, or showing blood in their urine is showing signs consistent with a UTI rather than simply needing more toilet breaks. These signs warrant veterinary assessment and urinalysis.
Can a dog UTI resolve on its own?
Occasionally mild UTIs may resolve without treatment, but this cannot be predicted and the risk of the infection ascending to the kidneys or becoming chronic is significant. Antibiotics are the appropriate treatment for confirmed bacterial UTIs. Do not wait to see if signs resolve on their own.
How long does it take for a UTI to clear up with antibiotics?
Most dogs show improvement in clinical signs within 2 to 3 days of starting antibiotics. However, the full antibiotic course — typically 7 to 14 days for uncomplicated infections — must be completed to ensure full resolution. A follow-up urinalysis confirms the infection has cleared.
My dog was treated for a UTI last month and has the same signs again — what does this mean?
Recurrent UTIs almost always indicate an underlying predisposing condition. A repeat UTI within weeks of completing treatment should prompt investigation into bladder stones, bladder tumour, prostate disease, anatomical abnormality, or systemic disease. A urine culture and imaging are the appropriate next steps rather than repeating the same antibiotic course.
Can male dogs get UTIs?
Yes, though they are significantly less common in male dogs than females due to the longer urethra. A UTI in an intact male dog should prompt investigation of the prostate. Any male dog straining to urinate with no urine output should be assessed as an emergency — this may represent a urinary blockage rather than a UTI.
