Bladder Paralysis (Atony) in Dogs and Cats
📝 Summary
Bladder paralysis is loss of normal bladder contraction, usually from a urethral blockage, bladder spasm, or spinal or brain injury, so urine pools and cannot be expelled. Signs range from frequent dribbling to silent, involuntary leakage. Veterinary care and assisted emptying prevent a dangerously overfull bladder.
1 Symptoms
When paralysis follows a blockage or sphincter spasm (early or partial), the animal frequently tries to urinate but passes only a few drops or a thin stream, or none at all.
When paralysis follows spinal or brain injury (or is complete), there is no urge to urinate and no straining; only a small amount leaks out once the bladder is very full. Pressing the belly or passing a catheter releases a large volume. If the sphincter is also paralyzed, urine leaks intermittently in a stream or drops, causing incontinence.
The bladder feels empty or holds little urine. Because urine is retained, the belly may swell, yet pressing the bladder causes no pain response.
2 Causes and Transmission
Bladder paralysis can follow a urethral blockage or sustained sphincter spasm that dulls the bladder muscle’s sensation, so it stops contracting. Spinal cord or brain injury is another common cause.
The result is the same: urine stagnates in the bladder, raising abdominal pressure and the risk of backflow and kidney damage if not relieved.
3 Diagnosis
A veterinarian identifies the pattern of lost urination reflex, the amount and character of urine passed, and whether the bladder is full or empty on palpation.
Imaging and a neurological exam help find the underlying cause, such as a blockage, spinal lesion, or injury, so it can be treated directly.
4 Treatment
Treatment removes the cause and supports the bladder. Urine is expressed or a catheter passed on a regular schedule to keep pressure down.
A veterinarian may prescribe a medication to stimulate bladder tone and, when infection complicates retention, a course of antibiotics. Any spinal or neurological disease is managed under veterinary direction.
5 Prevention and Home Care
Have a veterinarian investigate and treat the underlying urinary or neurological condition rather than only the signs. Learn to express the bladder or use a catheter on schedule as advised.
Gentle abdominal massage can help move urine in some cases. Keep the pet comfortable and follow up to confirm bladder tone is recovering.
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