Dog cannot urinate (blocked bladder)
A dog that is straining to urinate, going to the spot again and again, crying, or producing only drops or no urine needs urgent veterinary care — this can be a urinary blockage. When the bladder cannot empty, pressure builds back to the kidneys and toxins and potassium rise, which can become life-threatening within a day. Male dogs are at higher risk. Do not wait to see if it improves overnight; call a veterinarian or emergency hospital now and describe the straining and how much urine, if any, is coming out.
Go to a vet now if
- Straining repeatedly with little or no urine produced
- Crying or showing pain when trying to urinate
- A firm, painful, swollen lower belly
- Vomiting, weakness, collapse, or no urine for many hours
Call a vet today if
- Urinating more often or with mild discomfort but still passing normal amounts
- Blood-tinged urine in a dog that is otherwise bright and producing urine
What to tell the vet
- How long since your dog last passed a normal amount of urine
- Whether any urine is coming out
- Straining, crying, or licking the area
- Whether the belly looks or feels swollen
- Sex, age, and any history of stones or crystals
- Diet, weight, and medications
What not to do
- Do not wait overnight to see if it clears — a full blockage worsens fast
- Do not press on or squeeze the belly to try to make urine come out
- Do not restrict water, and do not give human medicines
What your vet may check
Your vet may feel the bladder, check for a blockage, and run blood tests to assess the kidneys and potassium. Treatment can include relieving the obstruction, fluids, and monitoring, and is always veterinary-led.
Recovery support after veterinary assessment
After a blockage is relieved, your vet will guide diet, hydration, and monitoring to reduce the chance of recurrence. Any supportive nutrition during recovery is used on veterinary advice and is never a home response to straining.
Frequently asked questions
Is a dog not being able to urinate an emergency?
Yes. Straining with little or no urine can mean a urinary blockage, which can damage the kidneys and become life-threatening within a day. Call a vet immediately.
Why are male dogs at higher risk of blockage?
The male urethra is longer and narrower, so stones, crystals or plugs are more likely to lodge and block urine flow. Any straining male dog with little urine needs urgent assessment.
My dog is straining but passing some urine — should I wait?
Contact your vet promptly. Even partial straining can progress to a full blockage, and a vet can tell whether it is a urinary tract problem that needs same-day care.
← More breathing & collapse emergencies
Related emergency guides
Sources & standards
Emergency guidance follows AVMA, Merck Veterinary Manual, ASPCA Animal Poison Control, and small-animal emergency-medicine standards, reviewed by our veterinary advisory board.