Urethral diseases occur less frequently in female dogs and cats.
The most common urethral abnormality observed on survey radiographs is an abnormal radiographic density associated with the urethra. In male dogs, the most common site of urethral obstruction is proximal to the proximal portion of the os penis. However, other sites within the prostatic or membranous urethra may also be involved. In the female dog and cat, the most common site of obstruction is at the urethral orifice. In the male cat, the most common site of urethral obstruction with uroliths is at the proximal portion of the penile urethra.