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 Oct. 20, 1954, a 6-month-old Shetland pony was admitted to Stange Memorial Clinic. The history revealed that the animal had been treated for impaction on October 18. Oil and enemas were given by the local practicing veterinarian to no avail. Therefore, a laparotomy was decided upon.
"Impaction of the Small Colon in a Shetland Pony,"
Iowa State University Veterinarian: Vol. 17
, Article 13.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol17/iss2/13