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 thirteen and one-half-year-old Airedale Terrier was admitted to Stange Memorial Clinic on July 2, 1953. The history revealed that the animal was constantly straining to defecate, drank excessive amounts of water and had suffered four heart attacks, the last being about a month previous. Further, the dog was unable to walk, had a fair appetite and had no vomitus during the preceding week.
"Coronary Thrombosis in a Dog,"
Iowa State University Veterinarian: Vol. 16
, Article 10.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol16/iss1/10