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
Paraphimosis is a condition in which the glans of the penis cannot be withdrawn into the prepuce. The condition is probably more common in the horse than any other domestic animal with the possible exception of the dog.
Henning, E. R.
"Paraphimosis in Equine,"
Iowa State University Veterinarian: Vol. 6
, Article 14.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol6/iss2/14