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 5-month-old female Collie dog was examined for intermittent gagging and labored respiration of 7 days duration. Physical examination showed good general body condition. Ausculation of the thorax revealed loud heart sounds on the right side and weak heart sounds on the left side. Lung sounds were normal on the right side but on the left side normal lung sounds were absent and intestinal sounds were heard.
Landers, E. A.
Iowa State University Veterinarian: Vol. 40
, Article 14.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol40/iss2/14