This section is from the book "The Horse - Its Treatment In Health And Disease", by J. Wortley Axe. Also available from Amazon: The Horse. Its Treatment In Health And Disease.
Here there is an inability to retain urine, which is discharged involuntarily, and cannot be controlled by the patient.
This may be due to a relaxed or paralytic condition of the muscle which guards the neck of the bladder, and ordinarily prevents the urine from passing out; it may also result from injuries, morbid growths, or the partial blocking with calculi.
If caused by a mechanical impediment it may sometimes be removed by the passage of a catheter into the bladder, or by the forcible injection of fluids from a syringe into the urethral canal. Where a calculus exists in the urethral passage it may require a surgical operation.
 
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