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 nine - year- old male dog of mixed Boston Terrior ancestry was admitted to the Stange Memorial Clinic on Oct. 14, 1942. The history presented was that the dog had had a swelling in the anal region for some time.
Fistler, R. A.
"Perineal Hernia in a Dog,"
Iowa State University Veterinarian: Vol. 5
, Article 15.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol5/iss2/15