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 Nov. 6, 1952, a ten-year-old female Cocker Spaniel was admitted to the Stange Memorial Clinic for removal of multiple tumors of the mammary glands. The only history obtained was of a previous oophorohysterectomy with no indication of how long the tumors had been present.
"Removal of Multiple Tumors of the Mammary Glands,"
Iowa State University Veterinarian: Vol. 15
, Article 9.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol15/iss2/9