A case of recurrent cystic calculi was brought to the Stange Memorial Clinic on July 19, 1943. The patient, a 9-year-old female Scottish Terrier, had 53 small bladder stones removed surgically at the clinic 3 years prior to her readmittance. Diagnosis of the condition was made from the history of previous lithiasis, frequent micturition with hematuria, and by abdominal palpation.