Segmental replacement of the left ureter was done using a pedicled and tapered gastric flap in ten dogs. All were followed up for 12 weeks. The results of the operation were good. Serum electrolyte imbalance was not observed in any dog. Intravenous pyelograms were normal except in one animal that had mild calyceal dilatation. Postoperative values of blood urea nitrogen (BUN) and creatinine were normal when compared with preoperative values. Pathologic examinations of the left kidney, left ureter, and gastric ureter of the dogs were normal. We believe that incorporating a pedicled and tapered gastric flap into the urinary tract to bridge a ureteral defect is a new, safe, and effective clinical alternative.