A retrospective analysis was performed with 30 cases of canine urolithiasis presented in the period between January and December 2001 The miniature schnauzer (6 cases), maltese (5 cases) and Shih Tzu (4 cases) had higher incidences than other breeds. Canine urolithiasis occurred from one year till 12 years, but the most prevalent age was 3 years. Urinary calculi occurred more often in males (63%) than females. The most prevalent anatomic locations of calculi were urinary bladder (8 of 22 cases) and urethra (13 of 22 cases) in males and urinary bladder (10 of 18 cases) in females. The major mineral component of calculi was struvite (72%). In male dogs, out of 15 cases, 10 cases were struvite and 5 cases were calcium oxalate uroliths. And, in female dogs, 8 of 10 cases were struvite. In some cases, mineral composition and urine pH was not matched. In conclusion, in the dogs with predisposing factors for urolithiasis, regular examination or proper diet should be added to prevent the disease. And the mineral composition of calculi should not be predicted solely by the pH or crystal component of urine.