This is a case study of Sarge, a ten year old male castrated Dalmation, presented to Cornell University Hospital for Animals Medicine Service for urinary obstruction and cystoscopy. He was obstructed by urinary calculi and the stones were discovered to be 100% urate due to a primary defect in his purine metabolism. Sarge was managed with a diet change for a period of time. He returned again to Cornell with ammonium biurate crystaluria and presumptive urate uroliths. His uric acid excetion was quantified and it was recommended he start allopurinol therapy. He has since been successfully managed stone free on allopurinol therapy.