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
Severe post partem hemorrhage is practically confined to the cow and mare, yet occasionally our small animals are victims of severe hemorrhage after whelping. This hemorrhage has the possibility of two origins; it may be placental, as a result of detachment of the chorionic membranes from the maternal tissues, or it may be traumatic in origin. The former was probably the case of a Boston bitch that was presented to the Stange Memorial Clinic.
Quick, Harry L.
"Metorrhagia in the Bitch,"
Iowa State University Veterinarian: Vol. 7
, Article 13.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol7/iss2/13