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
On April 1, 1957, a 7-year old male shepherd dog was admitted to Stange Memorial Clinic with a history of a tumor in the perineal region.
"Hyperplastic Prostate Gland in Perineal Hernia of Dog,"
Iowa State University Veterinarian: Vol. 19
, Article 13.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol19/iss3/13