what lining does urethra have
Urethral Prolapse in Dogs. Urethral prolapse is a condition where the urethra 's mucosal lining (the mucus-producing lining of the canal that carries urine out of the bladder) falls out of place, often moving to the outer portion of the urethra, vaginal, or penile opening, making it visible.rethral Prolapse in Dogs. Urethral prolapse is a condition where the urethra 's mucosal lining (the mucus-producing lining of the canal that carries urine out of the bladder) falls out of place, often moving to the outer portion of the urethra, vaginal, or penile opening, making it visible.