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 Nov. 3, 1957, a 12-year old, spayed, Toy Collie bitch was admitted to the Stange Memorial Clinic. A history of frequent urination, which produced only a few drops of urine, was given. Also, the dog was mildly depressed and anorexic but showed no vomition. Upon abdominal palpation the urinary bladder was found to be greatly distended; firm objects could be felt that produced a gritting sensation when they moved against each other. A diagnosis of cystic calculi was made.
"Cystic Calculi in a 12-Year-Old Bitch,"
Iowa State University Veterinarian: Vol. 20
, Article 9.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol20/iss2/9