Iowa State University Veterinarian Records, RS 22/6/0/9, University Archives, Special Collections Department, Iowa State University, http://www.add.lib.iastate.edu/spcl/arch/rgrp/22-6-0-9.html
A seven year old female fox terrier with a history of unsuccessful attempts at urination was presented at the office of Dr. Herbert Lothe, Waukesha, Wis. The enlarged abdomen lead Dr. Lothe to believe the dog's bladder was distended with urine. An attempt to catheterize her was unsuccessful because of an obstruction at the anterior end of the urethra preventing the entrance of the catheter into the bladder. Permission was obtained from the owner to surgically remove the obstruction.
"A Fibroma in the Wall of the Bladder,"
Iowa State University Veterinarian: Vol. 3
, Article 9.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol3/iss1/9