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 Dec. 6, 1-952 a 13-month-old female Boxer was admitted to the Stange Memorial Clinic. The accompanying history was as follows: The patient had been spayed at approximately 3 months of age and had a very slow convalescence during which time the back was constantly held in an arched position. In four or five weeks, the dog seemingly recovered and remained in good condition for about four months. In July, the owner first noticed that there was a slight abdominal enlargement. From that time on, until its admittance to the Clinic in December, the enlargement was progressive and was accompanied by loss in weight and condition. The appetite remained good at all times. The dog was said to have difficulty in arising from a sitting or lying position.
Buckman, R. John
"Hydronephrosis in a Dog,"
Iowa State University Veterinarian: Vol. 15
, Article 7.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol15/iss2/7