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 gray American Saddle gelding was presented at the Stange Memorial Clinic with his tail deviating dorsally and laterally. The tail at its emergence from the tail head turned sharply up and then bent anteriorly and to the left. There were many scars around the tail head which indicated numerous previous operations.
Penkert, R. A.
"Tail Surgery in a Horse,"
Iowa State University Veterinarian: Vol. 5
, Article 12.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol5/iss2/12