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 female Great Dane, aged seven, was admitted to the Stange Memorial Clinic on March 24. The history received was that the dog had been depressed and off feed. The owner also reported observing a purulent discharge from the vulva. The dog had previously been given ergotrate as a uterine stimulant
Fistler, R. P.
"Pyometra in a Bitch,"
Iowa State University Veterinarian: Vol. 4
, Article 14.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol4/iss3/14