On March 30, 1951 an 8-year-old Boston Terrier male was admitted to Stange Memorial Clinic. The history was one of constant straining. Examination revealed a large swelling surrounding the anus. A catheter was passed up the urethra and into the bladder without difficulty; hence it seemed doubtful if the bladder was contained in the hernial sac. A diagnosis of bilateral perineal hernia was made.