Why can’t my dog wee?

The inability to urinate in dogs can stem from a variety of causes, each impacting different areas of their health. From a medical perspective, it indicates a potential underlying issue that requires prompt veterinary attention. Left untreated, this condition can lead to severe complications, including bladder rupture, which can pose a significant risk to your pet.

On a physiological level, when a dog is unable to urinate, the bladder can become overly distended, which puts stress on other organs, potentially leading to kidney damage or chronic incontinence in the future. Urination itself involves a complex interplay of muscles contracting and relaxing, so disruptions in this process can signal problems across multiple systems.

From a pet owner’s point of view, recognising early signs—such as straining, discomfort, or a complete inability to urinate—allows for quicker intervention and may prevent long-term health consequences. In any case, if your dog shows symptoms, seeking veterinary guidance as soon as possible is crucial for their well-being.

Symptoms of inability to urinate in dogs

The inability to urinate can quickly become an urgent situation. Don't delay in taking your dog to the veterinarian if you see any of the following symptoms:

• Urine that flows in spurts or trickles
• Frequent attempts to urinate (often delayed and without success)
• Showing strain when attempting to pass urine
• Leakage (this may happen because the bladder is so full that it cannot hold any more liquid)
• Blood in the urine
• Licking of urinary opening
• Low appetite
• Vomiting
• Tender abdominal area
• Lethargy
• Disinterest in normal activities
• Abdominal bloating

What to expect at the vet

When you arrive at the clinic or hospital with your dog, expect to share detailed observations of any symptoms or changes in behavior. From a diagnostic perspective, the veterinarian will likely start with a thorough physical examination, followed by a urinalysis. This test can reveal signs of infection or inflammation, giving initial clues about the issue. Blood tests, including a complete blood count (CBC) and a chemistry profile, may also be conducted to assess overall health and identify any underlying conditions.

If a straightforward infection isn’t identified or if further investigation is warranted, the veterinarian may insert a urethral catheter to check for possible blockages. This step is particularly relevant for male dogs, as they are more prone to urethral obstructions due to the narrower structure of their urethra.

Depending on the findings, additional tests might be recommended, each offering unique insights. For instance:

• Abdominal palpation allows the vet to manually check for abnormalities in the kidneys and bladder.
• CT scans provide a closer look at the caudal spine, especially if a tumor is suspected.
• Myelography uses a contrast dye in X-rays to detect potential spinal cord injuries.
• Epidurography offers a detailed view of spinal areas, such as identifying spinal cysts.
• Abdominal ultrasound examines the kidneys and bladder more closely.
• Cystoscopy involves inserting a scope to visualize the lower urinary tract, which can reveal any structural issues directly.

These diagnostic tools help build a comprehensive picture of your dog’s health, enabling the veterinarian to tailor treatment based on specific findings.

Treatment

Treatment for a dog’s inability to urinate will vary based on the underlying cause, with a focus on providing immediate relief and preventing complications. The veterinarian’s priorities will be to alleviate your dog’s discomfort and address the issue before it worsens. Depending on the diagnosis, treatment options may include:

• For urinary tract infections: Antibiotics are administered to target the infection.
• Increased water intake: Encouraging hydration can support urinary health.
• Urinary acidifiers or alkalinisers: Adjusting urinary pH may be necessary to prevent recurring issues.
• Medication to relax the bladder and urethra: This can help relieve pressure and improve urine flow.
• Bladder catheterization: In some cases, catheterization up to three times daily may be required to help drain the bladder.
• Manual bladder expression: Regular intervals of bladder expression, sometimes several times a day, may be necessary if your dog’s condition (e.g., spinal injury) prevents normal urination.
• For obstructions: If a blockage cannot be shifted back into the bladder (retropulsion), surgery may be needed.
• Bladder stones: Some types of stones can be dissolved with dietary adjustments.
• Congenital abnormalities: Surgical correction may be required to resolve structural issues.
• Enlarged prostate in non-neutered males: Treatment may be followed by neutering to prevent recurrence.