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 seven-year-old male Airdale was found upon clinical examination to have neoplasms in the lungs as well as on the back of the lumbar region. The grose and microscopic post mortem examination revealed the neoplasms to originate from the perianal glands and to be metastatic in the lungs, kidneys, liver, lymph nodes, and intestine.
Mekus, Max A. and Svenson, William M.
"Metastasis of a Perianal Gland Adenocarcinoma in a Dog,"
Iowa State University Veterinarian: Vol. 30
, Article 5.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol30/iss2/5