Subcutaneous ureteral bypass (SUB) is a standard treatment for feline ureteral obstruction, but is usually performed under fluoroscopic guidance. We examined the treatment results, complications, and long-term outcome of SUB placed under ultrasound guidance and intraoperative radiography, without fluoroscopic guidance, in 13 cats. As reported in previous studies, the increased BUN and creatinine values improved after SUB placement under ultrasonic guidance, and the general condition of the cats improved. The postoperative infection rate was slightly higher in the present study than in previous studies; however, the long-term outcome was favorable, and SUB placement under ultrasound guidance for ureteral obstruction in cats was considered effective. As a sub-study on the prevention of SUB catheter obstruction, we examined the relationship between dietary content change and urine specific gravity, but did not obtain clear results because of the limited number of cases. Further study is necessary to clarify this issue.